/*
 * SPDX license identifier: MPL-2.0
 *
 * Copyright (C) 2011-2015, BMW AG
 *
 * This file is part of GENIVI Project DLT - Diagnostic Log and Trace.
 *
 * This Source Code Form is subject to the terms of the
 * Mozilla Public License (MPL), v. 2.0.
 * If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * For further information see http://www.genivi.org/.
 */

/*!
 * \author
 * Alexander Wenzel <alexander.aw.wenzel@bmw.de>
 * Markus Klein <Markus.Klein@esk.fraunhofer.de>
 * Mikko Rapeli <mikko.rapeli@bmw.de>
 *
 * \copyright Copyright © 2011-2015 BMW AG. \n
 * License MPL-2.0: Mozilla Public License version 2.0 http://mozilla.org/MPL/2.0/.
 *
 * \file dlt_user.c
 */

#include <stdlib.h> /* for getenv(), free(), atexit() */
#include <string.h> /* for strcmp(), strncmp(), strlen(), memset(), memcpy() */
#include <signal.h> /* for signal(), SIGPIPE, SIG_IGN */

#if !defined (__WIN32__)
#   include <syslog.h> /* for LOG_... */
#   include <semaphore.h>
#   include <pthread.h> /* POSIX Threads */
#endif

#include <sys/time.h>
#include <math.h>

#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>

#include <sys/uio.h> /* writev() */
#include <poll.h>

#include <limits.h>
#ifdef linux
#   include <sys/prctl.h> /* for PR_SET_NAME */
#endif

#include <sys/types.h> /* needed for getpid() */
#include <unistd.h>

#include <stdbool.h>

#include <stdatomic.h>

#if defined DLT_LIB_USE_UNIX_SOCKET_IPC || defined DLT_LIB_USE_VSOCK_IPC
#   include <sys/socket.h>
#endif
#ifdef DLT_LIB_USE_UNIX_SOCKET_IPC
#   include <sys/un.h>
#endif
#ifdef DLT_LIB_USE_VSOCK_IPC
#   ifdef linux
#       include <linux/vm_sockets.h>
#   endif
#   ifdef __QNX__
#       include <vm_sockets.h>
#   endif
#endif

#include "dlt_user.h"
#include "dlt_common.h"
#include "dlt_user_shared.h"
#include "dlt_user_shared_cfg.h"
#include "dlt_user_cfg.h"

#ifdef DLT_FATAL_LOG_RESET_ENABLE
#   define DLT_LOG_FATAL_RESET_TRAP(LOGLEVEL) \
    do {                                   \
        if (LOGLEVEL == DLT_LOG_FATAL) {   \
            int *p = NULL;                 \
            *p = 0;                        \
        }                                  \
    } while (0)
#else /* DLT_FATAL_LOG_RESET_ENABLE */
#   define DLT_LOG_FATAL_RESET_TRAP(LOGLEVEL)
#endif /* DLT_FATAL_LOG_RESET_ENABLE */

static DltUser dlt_user;
static atomic_bool dlt_user_initialised = false;
static int dlt_user_freeing = 0;
static bool dlt_user_file_reach_max = false;

#ifdef DLT_LIB_USE_FIFO_IPC
static char dlt_user_dir[DLT_PATH_MAX];
static char dlt_daemon_fifo[DLT_PATH_MAX];
#endif

static sem_t dlt_mutex;
static pthread_t dlt_housekeeperthread_handle;

/* calling dlt_user_atexit_handler() second time fails with error message */
static int atexit_registered = 0;

/* used to disallow DLT usage in fork() child */
static int g_dlt_is_child = 0;
/* String truncate message */
static const char STR_TRUNCATED_MESSAGE[] = "... <<Message truncated, too long>>";

/* Enum for type of string */
enum StringType
{
    ASCII_STRING = 0,
    UTF8_STRING = 1
};

/* Data type holding "Variable Info" (VARI) properties
 * Some of the supported data types (eg. bool, string, raw) have only "name", but not "unit".
 */
typedef struct VarInfo
{
    const char *name;  // the "name" attribute (can be NULL)
    const char *unit;  // the "unit" attribute (can be NULL)
    bool with_unit;    // true if the "unit" field is to be considered
} VarInfo;

#define DLT_UNUSED(x) (void)(x)

/* Network trace */
#ifdef DLT_NETWORK_TRACE_ENABLE
#define DLT_USER_SEGMENTED_THREAD (1<<2)

/* Segmented Network Trace */
#define DLT_MAX_TRACE_SEGMENT_SIZE 1024
#define DLT_MESSAGE_QUEUE_NAME "/dlt_message_queue"
#define DLT_DELAYED_RESEND_INDICATOR_PATTERN 0xFFFF

/* Mutex to wait on while message queue is not initialized */
pthread_mutex_t mq_mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t mq_init_condition;
#endif /* DLT_NETWORK_TRACE_ENABLE */

/* use these variables from common.c*/
extern int logging_mode;
extern FILE *logging_handle;

void dlt_lock_mutex(pthread_mutex_t *mutex)
{
    int32_t lock_mutex_result = pthread_mutex_lock(mutex);

    if (lock_mutex_result != 0)
        dlt_vlog(LOG_ERR,
                 "Mutex lock failed unexpected pid=%i with result %i!\n",
                 getpid(), lock_mutex_result);
}

void dlt_unlock_mutex(pthread_mutex_t *mutex)
{
    pthread_mutex_unlock(mutex);
}

/* Structure to pass data to segmented thread */
typedef struct
{
    DltContext *handle;
    uint32_t id;
    DltNetworkTraceType nw_trace_type;
    uint32_t header_len;
    void *header;
    uint32_t payload_len;
    void *payload;
} s_segmented_data;

/* Function prototypes for internally used functions */
static void dlt_user_housekeeperthread_function(void *ptr);
static void dlt_user_atexit_handler(void);
static DltReturnValue dlt_user_log_init(DltContext *handle, DltContextData *log);
static DltReturnValue dlt_user_log_send_log(DltContextData *log, int mtype);
static DltReturnValue dlt_user_log_send_register_application(void);
static DltReturnValue dlt_user_log_send_unregister_application(void);
static DltReturnValue dlt_user_log_send_register_context(DltContextData *log);
static DltReturnValue dlt_user_log_send_unregister_context(DltContextData *log);
static DltReturnValue dlt_send_app_ll_ts_limit(const char *apid,
                                               DltLogLevelType loglevel,
                                               DltTraceStatusType tracestatus);
static DltReturnValue dlt_user_log_send_log_mode(DltUserLogMode mode);
static DltReturnValue dlt_user_log_send_marker();
static DltReturnValue dlt_user_print_msg(DltMessage *msg, DltContextData *log);
static DltReturnValue dlt_user_log_check_user_message(void);
static void dlt_user_log_reattach_to_daemon(void);
static DltReturnValue dlt_user_log_send_overflow(void);
static DltReturnValue dlt_user_log_out_error_handling(void *ptr1,
                                                      size_t len1,
                                                      void *ptr2,
                                                      size_t len2,
                                                      void *ptr3,
                                                      size_t len3);
static void dlt_user_cleanup_handler(void *arg);
static int dlt_start_threads();
static void dlt_stop_threads();
static void dlt_fork_child_fork_handler();
#ifdef DLT_NETWORK_TRACE_ENABLE
static void dlt_user_trace_network_segmented_thread(void *unused);
static void dlt_user_trace_network_segmented_thread_segmenter(s_segmented_data *data);
#endif

static DltReturnValue dlt_user_log_write_string_utils_attr(DltContextData *log, const char *text, const enum StringType type, const char *name, bool with_var_info);
static DltReturnValue dlt_user_log_write_sized_string_utils_attr(DltContextData *log, const char *text, uint16_t length, const enum StringType type, const char *name, bool with_var_info);


static DltReturnValue dlt_unregister_app_util(bool force_sending_messages);

DltReturnValue dlt_user_check_library_version(const char *user_major_version, const char *user_minor_version)
{
    char lib_major_version[DLT_USER_MAX_LIB_VERSION_LENGTH];
    char lib_minor_version[DLT_USER_MAX_LIB_VERSION_LENGTH];

    dlt_get_major_version(lib_major_version, DLT_USER_MAX_LIB_VERSION_LENGTH);
    dlt_get_minor_version(lib_minor_version, DLT_USER_MAX_LIB_VERSION_LENGTH);

    if ((strcmp(lib_major_version, user_major_version) != 0) || (strcmp(lib_minor_version, user_minor_version) != 0)) {
        dlt_vnlog(LOG_WARNING,
                  DLT_USER_BUFFER_LENGTH,
                  "DLT Library version check failed! Installed DLT library version is %s.%s - Application using DLT library version %s.%s\n",
                  lib_major_version,
                  lib_minor_version,
                  user_major_version,
                  user_minor_version);

        return DLT_RETURN_ERROR;
    }

    return DLT_RETURN_OK;
}

#if defined DLT_LIB_USE_UNIX_SOCKET_IPC || defined DLT_LIB_USE_VSOCK_IPC
static DltReturnValue dlt_socket_set_nonblock_and_linger(int sockfd)
{
    int status;
    struct linger l_opt;

    status = fcntl(sockfd, F_SETFL, fcntl(sockfd, F_GETFL, 0) | O_NONBLOCK);
    if (status == -1) {
        dlt_log(LOG_INFO, "Socket cannot be changed to NON BLOCK\n");
        return DLT_RETURN_ERROR;
    }

    l_opt.l_onoff = 1;
    l_opt.l_linger = 10;

    if (setsockopt(sockfd, SOL_SOCKET, SO_LINGER, &l_opt, sizeof l_opt) < 0)
        dlt_log(LOG_WARNING, "Failed to set socket linger option\n");

    return DLT_RETURN_OK;
}
#endif

#ifdef DLT_LIB_USE_UNIX_SOCKET_IPC
static DltReturnValue dlt_initialize_socket_connection(void)
{
    struct sockaddr_un remote;
    char dltSockBaseDir[DLT_IPC_PATH_MAX];

    DLT_SEM_LOCK();
    int sockfd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);

    if (sockfd == DLT_FD_INIT) {
        dlt_log(LOG_CRIT, "Failed to create socket\n");
        DLT_SEM_FREE();
        return DLT_RETURN_ERROR;
    }

    if (dlt_socket_set_nonblock_and_linger(sockfd) != DLT_RETURN_OK) {
        close(sockfd);
        DLT_SEM_FREE();
        return DLT_RETURN_ERROR;
    }

    remote.sun_family = AF_UNIX;
    snprintf(dltSockBaseDir, DLT_IPC_PATH_MAX, "%s/dlt", DLT_USER_IPC_PATH);
    strncpy(remote.sun_path, dltSockBaseDir, sizeof(remote.sun_path));

    if (strlen(DLT_USER_IPC_PATH) > DLT_IPC_PATH_MAX)
        dlt_vlog(LOG_INFO,
                 "Provided path too long...trimming it to path[%s]\n",
                 dltSockBaseDir);

    if (connect(sockfd, (struct sockaddr *)&remote, sizeof(remote)) == -1) {
        if (dlt_user.connection_state != DLT_USER_RETRY_CONNECT) {
            dlt_vlog(LOG_INFO,
                     "Socket %s cannot be opened (errno=%d). Retrying later...\n",
                     dltSockBaseDir, errno);
            dlt_user.connection_state = DLT_USER_RETRY_CONNECT;
        }

        close(sockfd);
        dlt_user.dlt_log_handle = -1;
    }
    else {
        dlt_user.dlt_log_handle = sockfd;
        dlt_user.connection_state = DLT_USER_CONNECTED;

        if (dlt_receiver_init(&(dlt_user.receiver),
                              sockfd,
                              DLT_RECEIVE_SOCKET,
                              DLT_USER_RCVBUF_MAX_SIZE) == DLT_RETURN_ERROR) {
            dlt_user_initialised = false;
            close(sockfd);
            DLT_SEM_FREE();
            return DLT_RETURN_ERROR;
        }
    }

    DLT_SEM_FREE();

    return DLT_RETURN_OK;
}
#elif defined DLT_LIB_USE_VSOCK_IPC
static DltReturnValue dlt_initialize_vsock_connection()
{
    struct sockaddr_vm remote;

    DLT_SEM_LOCK();
    int sockfd = socket(AF_VSOCK, SOCK_STREAM, 0);

    if (sockfd == DLT_FD_INIT) {
        dlt_log(LOG_CRIT, "Failed to create VSOCK socket\n");
        DLT_SEM_FREE();
        return DLT_RETURN_ERROR;
    }

    memset(&remote, 0, sizeof(remote));
    remote.svm_family = AF_VSOCK;
    remote.svm_port = DLT_VSOCK_PORT;
    remote.svm_cid = VMADDR_CID_HOST;

    if (connect(sockfd, (struct sockaddr *)&remote, sizeof(remote)) == -1) {
        if (dlt_user.connection_state != DLT_USER_RETRY_CONNECT) {
            dlt_vlog(LOG_INFO, "VSOCK socket cannot be opened. Retrying later...\n");
            dlt_user.connection_state = DLT_USER_RETRY_CONNECT;
        }

        close(sockfd);
        dlt_user.dlt_log_handle = -1;
    }
    else {
        /* Set to non-blocking after connect() to avoid EINPROGRESS. DltUserConntextionState
           needs "connecting" state if connect() should be non-blocking. */
        if (dlt_socket_set_nonblock_and_linger(sockfd) != DLT_RETURN_OK) {
            close(sockfd);
            DLT_SEM_FREE();
            return DLT_RETURN_ERROR;
        }

        dlt_user.dlt_log_handle = sockfd;
        dlt_user.connection_state = DLT_USER_CONNECTED;

        if (dlt_receiver_init(&(dlt_user.receiver),
                              sockfd,
                              DLT_RECEIVE_SOCKET,
                              DLT_USER_RCVBUF_MAX_SIZE) == DLT_RETURN_ERROR) {
            dlt_user_initialised = false;
            close(sockfd);
            DLT_SEM_FREE();
            return DLT_RETURN_ERROR;
        }
    }

    DLT_SEM_FREE();

    return DLT_RETURN_OK;
}
#else /* DLT_LIB_USE_FIFO_IPC */
static DltReturnValue dlt_initialize_fifo_connection(void)
{
    char filename[DLT_PATH_MAX];
    int ret;

    snprintf(dlt_user_dir, DLT_PATH_MAX, "%s/dltpipes", dltFifoBaseDir);
    snprintf(dlt_daemon_fifo, DLT_PATH_MAX, "%s/dlt", dltFifoBaseDir);
    ret = mkdir(dlt_user_dir, S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH | S_ISVTX);

    if ((ret == -1) && (errno != EEXIST)) {
        dlt_vnlog(LOG_ERR, DLT_USER_BUFFER_LENGTH, "FIFO user dir %s cannot be created!\n", dlt_user_dir);
        return DLT_RETURN_ERROR;
    }

    /* if dlt pipes directory is created by the application also chmod the directory */
    if (ret == 0) {
        /* S_ISGID cannot be set by mkdir, let's reassign right bits */
        ret = chmod(dlt_user_dir,
                    S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IWGRP | S_IXGRP | S_IROTH | S_IWOTH | S_IXOTH | S_ISGID |
                    S_ISVTX);

        if (ret == -1) {
            dlt_vnlog(LOG_ERR, DLT_USER_BUFFER_LENGTH, "FIFO user dir %s cannot be chmoded!\n", dlt_user_dir);
            return DLT_RETURN_ERROR;
        }
    }

    /* create and open DLT user FIFO */
    snprintf(filename, DLT_PATH_MAX, "%s/dlt%d", dlt_user_dir, getpid());

    /* Try to delete existing pipe, ignore result of unlink */
    unlink(filename);

    ret = mkfifo(filename, S_IRUSR | S_IWUSR | S_IWGRP | S_IRGRP);

    if (ret == -1)
        dlt_vnlog(LOG_WARNING, DLT_USER_BUFFER_LENGTH, "Loging disabled, FIFO user %s cannot be created!\n", filename);

    /* S_IWGRP cannot be set by mkfifo (???), let's reassign right bits */
    ret = chmod(filename, S_IRUSR | S_IWUSR | S_IWGRP | S_IRGRP);

    if (ret == -1) {
        dlt_vnlog(LOG_WARNING, DLT_USER_BUFFER_LENGTH, "FIFO user %s cannot be chmoded!\n", dlt_user_dir);
        return DLT_RETURN_ERROR;
    }

    dlt_user.dlt_user_handle = open(filename, O_RDWR | O_NONBLOCK | O_CLOEXEC);

    if (dlt_user.dlt_user_handle == DLT_FD_INIT) {
        dlt_vnlog(LOG_WARNING, DLT_USER_BUFFER_LENGTH, "Logging disabled, FIFO user %s cannot be opened!\n", filename);
        unlink(filename);
        return DLT_RETURN_OK;
    }

    /* open DLT output FIFO */
    dlt_user.dlt_log_handle = open(dlt_daemon_fifo, O_WRONLY | O_NONBLOCK | O_CLOEXEC);

    if (dlt_user.dlt_log_handle == -1)
        /* This is a normal usecase. It is OK that the daemon (and thus the FIFO /tmp/dlt)
         * starts later and some DLT users have already been started before.
         * Thus it is OK if the FIFO can't be opened. */
        dlt_vnlog(LOG_INFO, DLT_USER_BUFFER_LENGTH, "FIFO %s cannot be opened. Retrying later...\n",
                  dlt_daemon_fifo);

    return DLT_RETURN_OK;
}
#endif

DltReturnValue dlt_init(void)
{
    /* Compare 'dlt_user_initialised' to false. If equal, 'dlt_user_initialised' will be set to true.
    Calls retruns true, if 'dlt_user_initialised' was false.
    That way it's no problem, if two threads enter this function, because only the very first one will
    pass fully. The other one will immediately return, because when it executes the atomic function
    'dlt_user_initialised' will be for sure already set to true.
    */
    bool expected = false;
    if (!(atomic_compare_exchange_strong(&dlt_user_initialised, &expected, true)))
        return DLT_RETURN_OK;

    /* check environment variables */
    dlt_check_envvar();

    /* Check logging mode and internal log file is opened or not*/
    if(logging_mode == DLT_LOG_TO_FILE && logging_handle == NULL)
    {
        dlt_log_init(logging_mode);
    }

    /* process is exiting. Do not allocate new resources. */
    if (dlt_user_freeing != 0) {
        dlt_vlog(LOG_INFO, "%s logging disabled, process is exiting", __func__);
        /* return negative value, to stop the current log */
        return DLT_RETURN_LOGGING_DISABLED;
    }

    /* Initialize common part of dlt_init()/dlt_init_file() */
    if (dlt_init_common() == DLT_RETURN_ERROR) {
        dlt_user_initialised = false;
        return DLT_RETURN_ERROR;
    }

    dlt_user.dlt_is_file = 0;
    dlt_user.filesize_max = UINT_MAX;
    dlt_user_file_reach_max = false;

    dlt_user.overflow = 0;
    dlt_user.overflow_counter = 0;
#ifdef DLT_SHM_ENABLE
    memset(&(dlt_user.dlt_shm), 0, sizeof(DltShm));

    /* init shared memory */
    if (dlt_shm_init_client(&(dlt_user.dlt_shm), dltShmName) < DLT_RETURN_OK)
        dlt_vnlog(LOG_WARNING, DLT_USER_BUFFER_LENGTH, "Logging disabled,"
                  " Shared memory %s cannot be created!\n", dltShmName);

#endif

#ifdef DLT_LIB_USE_UNIX_SOCKET_IPC

    if (dlt_initialize_socket_connection() != DLT_RETURN_OK)
        /* We could connect to the pipe, but not to the socket, which is normally */
        /* open before by the DLT daemon => bad failure => return error code */
        /* in case application is started before daemon, it is expected behaviour */
        return DLT_RETURN_ERROR;

#elif defined DLT_LIB_USE_VSOCK_IPC

    if (dlt_initialize_vsock_connection() != DLT_RETURN_OK)
        return DLT_RETURN_ERROR;

#else /* DLT_LIB_USE_FIFO_IPC */

    if (dlt_initialize_fifo_connection() != DLT_RETURN_OK)
        return DLT_RETURN_ERROR;

    if (dlt_receiver_init(&(dlt_user.receiver),
                          dlt_user.dlt_user_handle,
                          DLT_RECEIVE_FD,
                          DLT_USER_RCVBUF_MAX_SIZE) == DLT_RETURN_ERROR) {
        dlt_user_initialised = false;
        return DLT_RETURN_ERROR;
    }

#endif

#ifdef DLT_NETWORK_TRACE_ENABLE
    /* These will be lazy initialized only when needed */
    dlt_user.dlt_segmented_queue_read_handle = -1;
    dlt_user.dlt_segmented_queue_write_handle = -1;

    pthread_cond_init(&mq_init_condition, NULL);
#endif

    if (dlt_start_threads() < 0) {
        dlt_user_initialised = false;
        return DLT_RETURN_ERROR;
    }

    /* prepare for fork() call */
    pthread_atfork(NULL, NULL, &dlt_fork_child_fork_handler);

    return DLT_RETURN_OK;
}

DltReturnValue dlt_get_appid(char *appid)
{
    if (appid != NULL) {
        strncpy(appid, dlt_user.appID, 4);
        return DLT_RETURN_OK;
    } else {
        dlt_log(LOG_ERR, "Invalid parameter.\n");
        return DLT_RETURN_WRONG_PARAMETER;
    }
}

DltReturnValue dlt_init_file(const char *name)
{
    /* check null pointer */
    if (!name)
        return DLT_RETURN_WRONG_PARAMETER;

    /* Compare 'dlt_user_initialised' to false. If equal, 'dlt_user_initialised' will be set to true.
    Calls retruns true, if 'dlt_user_initialised' was false.
    That way it's no problem, if two threads enter this function, because only the very first one will
    pass fully. The other one will immediately return, because when it executes the atomic function
    'dlt_user_initialised' will be for sure already set to true.
    */
    bool expected = false;
    if (!(atomic_compare_exchange_strong(&dlt_user_initialised, &expected, true)))
        return DLT_RETURN_OK;

    /* Initialize common part of dlt_init()/dlt_init_file() */
    if (dlt_init_common() == DLT_RETURN_ERROR) {
        dlt_user_initialised = false;
        return DLT_RETURN_ERROR;
    }

    dlt_user.dlt_is_file = 1;

    /* open DLT output file */
    dlt_user.dlt_log_handle = open(name, O_WRONLY | O_CREAT,
                                   S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH); /* mode: wb */

    if (dlt_user.dlt_log_handle == -1) {
        dlt_vnlog(LOG_ERR, DLT_USER_BUFFER_LENGTH, "Log file %s cannot be opened!\n", name);
        dlt_user.dlt_is_file = 0;
        return DLT_RETURN_ERROR;
    }

    return DLT_RETURN_OK;
}

DltReturnValue dlt_set_filesize_max(unsigned int filesize)
{
    if (dlt_user.dlt_is_file == 0)
    {
        dlt_vlog(LOG_ERR, "%s: Library is not configured to log to file\n",
                 __func__);
        return DLT_RETURN_ERROR;
    }

    if (filesize == 0) {
        dlt_user.filesize_max = UINT_MAX;
    }
    else {
        dlt_user.filesize_max = filesize;
    }
    dlt_vlog(LOG_DEBUG, "%s: Defined filesize_max is [%d]\n", __func__,
             dlt_user.filesize_max);

    return DLT_RETURN_OK;
}

#ifdef DLT_NETWORK_TRACE_ENABLE
DltReturnValue dlt_init_message_queue(void)
{
    dlt_lock_mutex(&mq_mutex);

    if ((dlt_user.dlt_segmented_queue_read_handle >= 0) &&
        (dlt_user.dlt_segmented_queue_write_handle >= 0)) {
        /* Already intialized */
        dlt_unlock_mutex(&mq_mutex);
        return DLT_RETURN_OK;
    }

    /* Generate per process name for queue */
    char queue_name[NAME_MAX];
    snprintf(queue_name, NAME_MAX, "%s.%d", DLT_MESSAGE_QUEUE_NAME, getpid());

    /* Maximum queue size is 10, limit to size of pointers */
    struct mq_attr mqatr;
    mqatr.mq_flags = 0;
    mqatr.mq_maxmsg = 10;
    mqatr.mq_msgsize = sizeof(s_segmented_data *);
    mqatr.mq_curmsgs = 0;

    /**
     * Create the message queue. It must be newly created
     * if old one was left by a crashing process.
     * */
    dlt_user.dlt_segmented_queue_read_handle = mq_open(queue_name, O_CREAT | O_RDONLY | O_EXCL,
                                                       S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH,
                                                       &mqatr);

    if (dlt_user.dlt_segmented_queue_read_handle < 0) {
        if (errno == EEXIST) {
            dlt_log(LOG_WARNING, "Old message queue exists, trying to delete.\n");

            if (mq_unlink(queue_name) < 0)
                dlt_vnlog(LOG_CRIT, 256, "Could not delete existing message queue!: %s \n", strerror(errno));
            else /* Retry */

                dlt_user.dlt_segmented_queue_read_handle = mq_open(queue_name,
                                                                   O_CREAT | O_RDONLY | O_EXCL,
                                                                   S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH,
                                                                   &mqatr);
        }

        if (dlt_user.dlt_segmented_queue_read_handle < 0) {
            dlt_vnlog(LOG_CRIT, 256, "Can't create message queue read handle!: %s \n", strerror(errno));
            dlt_unlock_mutex(&mq_mutex);
            return DLT_RETURN_ERROR;
        }
    }

    dlt_user.dlt_segmented_queue_write_handle = mq_open(queue_name, O_WRONLY | O_NONBLOCK);

    if (dlt_user.dlt_segmented_queue_write_handle < 0) {

        dlt_vnlog(LOG_CRIT, 256, "Can't open message queue write handle!: %s \n", strerror(errno));
        dlt_unlock_mutex(&mq_mutex);
        return DLT_RETURN_ERROR;
    }

    pthread_cond_signal(&mq_init_condition);
    dlt_unlock_mutex(&mq_mutex);
    return DLT_RETURN_OK;
}
#endif /* DLT_NETWORK_TRACE_ENABLE */

/* Return true if verbose mode is to be used for this DltContextData */
static inline bool is_verbose_mode(int8_t dltuser_verbose_mode, const DltContextData* log)
{
    return (dltuser_verbose_mode == 1) || (log != NULL && log->verbose_mode);
}

DltReturnValue dlt_init_common(void)
{
    char *env_local_print;
    char *env_initial_log_level;
    char *env_buffer_min;
    uint32_t buffer_min = DLT_USER_RINGBUFFER_MIN_SIZE;
    char *env_buffer_max;
    uint32_t buffer_max = DLT_USER_RINGBUFFER_MAX_SIZE;
    char *env_buffer_step;
    uint32_t buffer_step = DLT_USER_RINGBUFFER_STEP_SIZE;
    char *env_disable_extended_header_for_nonverbose;
    char *env_log_buffer_len;
    uint32_t buffer_max_configured = 0;
    uint32_t header_size = 0;

    /* Binary semaphore for threads */
    if (sem_init(&dlt_mutex, 0, 1) == -1) {
        dlt_user_initialised = false;
        return DLT_RETURN_ERROR;
    }

    /* set to unknown state of connected client */
    dlt_user.log_state = -1;

    dlt_user.dlt_log_handle = -1;
    dlt_user.dlt_user_handle = DLT_FD_INIT;

    dlt_set_id(dlt_user.ecuID, DLT_USER_DEFAULT_ECU_ID);
    dlt_set_id(dlt_user.appID, "");

    dlt_user.application_description = NULL;

    /* Verbose mode is enabled by default */
    dlt_user.verbose_mode = 1;

    /* header_size is used for resend buffer
     * so it won't include DltStorageHeader
     */
    header_size = sizeof(DltUserHeader) + sizeof(DltStandardHeader) +
                sizeof(DltStandardHeaderExtra);

    /* Use extended header for non verbose is enabled by default */
    dlt_user.use_extended_header_for_non_verbose =
            DLT_USER_USE_EXTENDED_HEADER_FOR_NONVERBOSE;

    /* Use extended header for non verbose is modified as per environment variable */
    env_disable_extended_header_for_nonverbose =
            getenv(DLT_USER_ENV_DISABLE_EXTENDED_HEADER_FOR_NONVERBOSE);

    if (env_disable_extended_header_for_nonverbose) {
        if (strcmp(env_disable_extended_header_for_nonverbose, "1") == 0)
            dlt_user.use_extended_header_for_non_verbose =
                    DLT_USER_NO_USE_EXTENDED_HEADER_FOR_NONVERBOSE;
    }

    if (dlt_user.use_extended_header_for_non_verbose ==
            DLT_USER_USE_EXTENDED_HEADER_FOR_NONVERBOSE)
        header_size += (uint32_t) sizeof(DltExtendedHeader);

    /* With session id is enabled by default */
    dlt_user.with_session_id = DLT_USER_WITH_SESSION_ID;

    /* With timestamp is enabled by default */
    dlt_user.with_timestamp = DLT_USER_WITH_TIMESTAMP;

    /* With timestamp is enabled by default */
    dlt_user.with_ecu_id = DLT_USER_WITH_ECU_ID;

    /* Local print is disabled by default */
    dlt_user.enable_local_print = 0;

    dlt_user.local_print_mode = DLT_PM_UNSET;

    dlt_user.timeout_at_exit_handler = DLT_USER_ATEXIT_RESEND_BUFFER_EXIT_TIMEOUT;

    env_local_print = getenv(DLT_USER_ENV_LOCAL_PRINT_MODE);

    if (env_local_print) {
        if (strcmp(env_local_print, "AUTOMATIC") == 0)
            dlt_user.local_print_mode = DLT_PM_AUTOMATIC;
        else if (strcmp(env_local_print, "FORCE_ON") == 0)
            dlt_user.local_print_mode = DLT_PM_FORCE_ON;
        else if (strcmp(env_local_print, "FORCE_OFF") == 0)
            dlt_user.local_print_mode = DLT_PM_FORCE_OFF;
    }

    env_initial_log_level = getenv("DLT_INITIAL_LOG_LEVEL");

    if (env_initial_log_level != NULL) {
        if (dlt_env_extract_ll_set(&env_initial_log_level, &dlt_user.initial_ll_set) != 0)
            dlt_vlog(LOG_WARNING,
                     "Unable to parse initial set of log-levels from environment! Env:\n%s\n",
                     getenv("DLT_INITIAL_LOG_LEVEL"));
    }

    /* Initialize LogLevel/TraceStatus field */
    DLT_SEM_LOCK();
    dlt_user.dlt_ll_ts = NULL;
    dlt_user.dlt_ll_ts_max_num_entries = 0;
    dlt_user.dlt_ll_ts_num_entries = 0;


    env_buffer_min = getenv(DLT_USER_ENV_BUFFER_MIN_SIZE);
    env_buffer_max = getenv(DLT_USER_ENV_BUFFER_MAX_SIZE);
    env_buffer_step = getenv(DLT_USER_ENV_BUFFER_STEP_SIZE);

    if (env_buffer_min != NULL) {
        buffer_min = (uint32_t)strtol(env_buffer_min, NULL, 10);

        if ((errno == EINVAL) || (errno == ERANGE)) {
            dlt_vlog(LOG_ERR,
                     "Wrong value specified for %s. Using default\n",
                     DLT_USER_ENV_BUFFER_MIN_SIZE);
            buffer_min = DLT_USER_RINGBUFFER_MIN_SIZE;
        }
    }

    if (env_buffer_max != NULL) {
        buffer_max = (uint32_t)strtol(env_buffer_max, NULL, 10);

        if ((errno == EINVAL) || (errno == ERANGE)) {
            dlt_vlog(LOG_ERR,
                     "Wrong value specified for %s. Using default\n",
                     DLT_USER_ENV_BUFFER_MAX_SIZE);
            buffer_max = DLT_USER_RINGBUFFER_MAX_SIZE;
        }
    }

    if (env_buffer_step != NULL) {
        buffer_step = (uint32_t)strtol(env_buffer_step, NULL, 10);

        if ((errno == EINVAL) || (errno == ERANGE)) {
            dlt_vlog(LOG_ERR,
                     "Wrong value specified for %s. Using default\n",
                     DLT_USER_ENV_BUFFER_STEP_SIZE);
            buffer_step = DLT_USER_RINGBUFFER_STEP_SIZE;
        }
    }

    /* init log buffer size */
    dlt_user.log_buf_len = DLT_USER_BUF_MAX_SIZE;
    env_log_buffer_len = getenv(DLT_USER_ENV_LOG_MSG_BUF_LEN);

    if (env_log_buffer_len != NULL) {
        buffer_max_configured = (uint32_t)strtol(env_log_buffer_len, NULL, 10);

        if (buffer_max_configured > DLT_LOG_MSG_BUF_MAX_SIZE) {
            dlt_user.log_buf_len = DLT_LOG_MSG_BUF_MAX_SIZE;
            dlt_vlog(LOG_WARNING,
                     "Configured size exceeds maximum allowed size,restricting to max [65535 bytes]\n");
        }
        else {
            dlt_user.log_buf_len = (uint16_t) buffer_max_configured;
            dlt_vlog(LOG_INFO,
                     "Configured buffer size to [%u bytes]\n",
                     buffer_max_configured);
        }
    }

    if (dlt_user.resend_buffer == NULL) {
        dlt_user.resend_buffer = calloc(sizeof(unsigned char),
                                        (dlt_user.log_buf_len + header_size));

        if (dlt_user.resend_buffer == NULL) {
            dlt_user_initialised = false;
            DLT_SEM_FREE();
            dlt_vlog(LOG_ERR, "cannot allocate memory for resend buffer\n");
            return DLT_RETURN_ERROR;
        }
    }

    dlt_user.disable_injection_msg = 0;
    if (getenv(DLT_USER_ENV_DISABLE_INJECTION_MSG)) {
        dlt_log(LOG_WARNING, "Injection message is disabled\n");
        dlt_user.disable_injection_msg = 1;
    }

    if (dlt_buffer_init_dynamic(&(dlt_user.startup_buffer),
                                buffer_min,
                                buffer_max,
                                buffer_step) == DLT_RETURN_ERROR) {
        dlt_user_initialised = false;
        DLT_SEM_FREE();
        return DLT_RETURN_ERROR;
    }

    DLT_SEM_FREE();

    signal(SIGPIPE, SIG_IGN);                  /* ignore pipe signals */

    if (atexit_registered == 0) {
        atexit_registered = 1;
        atexit(dlt_user_atexit_handler);
    }

#ifdef DLT_TEST_ENABLE
    dlt_user.corrupt_user_header = 0;
    dlt_user.corrupt_message_size = 0;
    dlt_user.corrupt_message_size_size = 0;
#endif

    return DLT_RETURN_OK;
}

void dlt_user_atexit_handler(void)
{
    /* parent will do clean-up */
    if (g_dlt_is_child)
        return;

    if (!dlt_user_initialised) {
        dlt_vlog(LOG_WARNING, "%s dlt_user_initialised false\n", __FUNCTION__);
        /* close file */
        dlt_log_free();
        return;
    }

    /* Try to resend potential log messages in the user buffer */
    int count = dlt_user_atexit_blow_out_user_buffer();

    if (count != 0)
        dlt_vnlog(LOG_WARNING, 128, "Lost log messages in user buffer when exiting: %i\n", count);

    /* Unregister app (this also unregisters all contexts in daemon) */
    /* Ignore return value */
    dlt_unregister_app_util(false);

    /* Cleanup */
    /* Ignore return value */
    dlt_free();
}

int dlt_user_atexit_blow_out_user_buffer(void)
{

    int count, ret;
    struct timespec ts;

    uint32_t exitTime = dlt_uptime() + dlt_user.timeout_at_exit_handler;

    /* Send content of ringbuffer */
    DLT_SEM_LOCK();
    count = dlt_buffer_get_message_count(&(dlt_user.startup_buffer));
    DLT_SEM_FREE();

    if (count > 0) {
        while (dlt_uptime() < exitTime) {
            if (dlt_user.dlt_log_handle == -1) {
                /* Reattach to daemon if neccesary */
                dlt_user_log_reattach_to_daemon();

                if ((dlt_user.dlt_log_handle != -1) && (dlt_user.overflow_counter)) {
                    if (dlt_user_log_send_overflow() == 0) {
                        dlt_vnlog(LOG_WARNING,
                                  DLT_USER_BUFFER_LENGTH,
                                  "%u messages discarded!\n",
                                  dlt_user.overflow_counter);
                        dlt_user.overflow_counter = 0;
                    }
                }
            }

            if (dlt_user.dlt_log_handle != -1) {
                ret = dlt_user_log_resend_buffer();

                if (ret == 0) {
                    DLT_SEM_LOCK();
                    count = dlt_buffer_get_message_count(&(dlt_user.startup_buffer));
                    DLT_SEM_FREE();

                    return count;
                }
            }

            ts.tv_sec = 0;
            ts.tv_nsec = DLT_USER_ATEXIT_RESEND_BUFFER_SLEEP;
            nanosleep(&ts, NULL);
        }

        DLT_SEM_LOCK();
        count = dlt_buffer_get_message_count(&(dlt_user.startup_buffer));
        DLT_SEM_FREE();
    }

    return count;
}

static void dlt_user_free_buffer(unsigned char **buffer)
{
    if (*buffer) {
        free(*buffer);
        *buffer = NULL;
    }
}

DltReturnValue dlt_free(void)
{
    uint32_t i;
    int ret = 0;
#ifdef DLT_LIB_USE_FIFO_IPC
    char filename[DLT_PATH_MAX];
#endif

    if (dlt_user_freeing != 0)
        /* resources are already being freed. Do nothing and return. */
        return DLT_RETURN_ERROR;

    /* library is freeing its resources. Avoid to allocate it in dlt_init() */
    dlt_user_freeing = 1;

    if (!dlt_user_initialised) {
        dlt_user_freeing = 0;
        return DLT_RETURN_ERROR;
    }

    dlt_user_initialised = false;

    dlt_stop_threads();

#ifdef DLT_LIB_USE_FIFO_IPC

    if (dlt_user.dlt_user_handle != DLT_FD_INIT) {
        close(dlt_user.dlt_user_handle);
        dlt_user.dlt_user_handle = DLT_FD_INIT;
        snprintf(filename, DLT_PATH_MAX, "%s/dlt%d", dlt_user_dir, getpid());
        unlink(filename);
    }

#endif

#ifdef DLT_SHM_ENABLE
    /* free shared memory */
    dlt_shm_free_client(&dlt_user.dlt_shm);
#endif

    if (dlt_user.dlt_log_handle != -1) {
        /* close log file/output fifo to daemon */
#if defined DLT_LIB_USE_UNIX_SOCKET_IPC || defined DLT_LIB_USE_VSOCK_IPC
        ret = shutdown(dlt_user.dlt_log_handle, SHUT_WR);

        if (ret < 0) {
            dlt_vlog(LOG_WARNING, "%s: shutdown failed: %s\n", __func__, strerror(errno));
        }
        else {
            ssize_t bytes_read = 0;
            int prev_errno = 0;
            struct pollfd nfd[1];
            nfd[0].events = POLLIN;
            nfd[0].fd = dlt_user.dlt_log_handle;

            while (1) {
                ret = poll(nfd, 1, DLT_USER_RECEIVE_MDELAY);

                /* In case failure of polling or reaching timeout,
                 * continue to close socket anyway.
                 * */
                if (ret < 0) {
                    dlt_vlog(LOG_WARNING, "[%s] Failed to poll with error [%s]\n",
                            __func__, strerror(errno));
                    break;
                }
                else if (ret == 0) {
                    dlt_vlog(LOG_DEBUG, "[%s] Polling timeout\n", __func__);
                    break;
                }
                else {
                    /* It could take some time to get the socket is shutdown
                     * So it means there could be some data available to read.
                     * Try to consume the data and poll the socket again.
                     * If read fails, time to close the socket then.
                     */
                    dlt_vlog(LOG_DEBUG, "[%s] polling returns [%d] with revent [0x%x]."
                            "There are something to read\n", __func__, ret, (unsigned int)nfd[0].revents);

                    bytes_read = read(dlt_user.dlt_log_handle, dlt_user.resend_buffer, dlt_user.log_buf_len);
                    prev_errno = errno;

                    if (bytes_read < 0) {
                        dlt_vlog(LOG_WARNING, "[%s] Failed to read with error [%s]\n",
                                __func__, strerror(prev_errno));

                        if ((prev_errno == EAGAIN) || (EWOULDBLOCK != EAGAIN && prev_errno == EWOULDBLOCK))
                            continue;
                        else
                            break;
                    }
                    if (bytes_read >= 0) {
                        if (!bytes_read)
                            break;
                        dlt_vlog(LOG_NOTICE, "[%s] data is still readable... [%ld] bytes read\n",
                                __func__, bytes_read);
                    }
                }
            }
        }

#endif
        ret = close(dlt_user.dlt_log_handle);

        if (ret < 0)
            dlt_vlog(LOG_WARNING, "%s: close failed: %s\n", __func__, strerror(errno));

        dlt_user.dlt_log_handle = -1;
    }

    /* Ignore return value */
    DLT_SEM_LOCK();
    dlt_receiver_free(&(dlt_user.receiver));
    DLT_SEM_FREE();

    /* Ignore return value */
    DLT_SEM_LOCK();

    dlt_user_free_buffer(&(dlt_user.resend_buffer));
    dlt_buffer_free_dynamic(&(dlt_user.startup_buffer));

    /* Clear and free local stored application information */
    if (dlt_user.application_description != NULL)
        free(dlt_user.application_description);
    dlt_user.application_description = NULL;

    if (dlt_user.dlt_ll_ts) {
        for (i = 0; i < dlt_user.dlt_ll_ts_max_num_entries; i++) {
            if (dlt_user.dlt_ll_ts[i].context_description != NULL) {
                free (dlt_user.dlt_ll_ts[i].context_description);
                dlt_user.dlt_ll_ts[i].context_description = NULL;
            }

            if (dlt_user.dlt_ll_ts[i].log_level_ptr != NULL) {
                free(dlt_user.dlt_ll_ts[i].log_level_ptr);
                dlt_user.dlt_ll_ts[i].log_level_ptr = NULL;
            }

            if (dlt_user.dlt_ll_ts[i].trace_status_ptr != NULL) {
                free(dlt_user.dlt_ll_ts[i].trace_status_ptr);
                dlt_user.dlt_ll_ts[i].trace_status_ptr = NULL;
            }

            if (dlt_user.dlt_ll_ts[i].injection_table != NULL) {
                free(dlt_user.dlt_ll_ts[i].injection_table);
                dlt_user.dlt_ll_ts[i].injection_table = NULL;
            }

            dlt_user.dlt_ll_ts[i].nrcallbacks = 0;
            dlt_user.dlt_ll_ts[i].log_level_changed_callback = 0;
        }

        free(dlt_user.dlt_ll_ts);
        dlt_user.dlt_ll_ts = NULL;
        dlt_user.dlt_ll_ts_max_num_entries = 0;
        dlt_user.dlt_ll_ts_num_entries = 0;
    }

    dlt_env_free_ll_set(&dlt_user.initial_ll_set);
    DLT_SEM_FREE();

#ifdef DLT_NETWORK_TRACE_ENABLE
    char queue_name[NAME_MAX];
    snprintf(queue_name, NAME_MAX, "%s.%d", DLT_MESSAGE_QUEUE_NAME, getpid());

    /**
     * Ignore errors from these, to not to spam user if dlt_free
     * is accidentally called multiple times.
     */
    if (dlt_user.dlt_segmented_queue_write_handle > 0)
        mq_close(dlt_user.dlt_segmented_queue_write_handle);

    if (dlt_user.dlt_segmented_queue_read_handle > 0)
        mq_close(dlt_user.dlt_segmented_queue_read_handle);

    if ((dlt_user.dlt_segmented_queue_write_handle > 0) ||
        (dlt_user.dlt_segmented_queue_read_handle > 0))
        mq_unlink(queue_name);

    dlt_user.dlt_segmented_queue_write_handle = DLT_FD_INIT;
    dlt_user.dlt_segmented_queue_read_handle = DLT_FD_INIT;

    pthread_cond_destroy(&mq_init_condition);
#endif /* DLT_NETWORK_TRACE_ENABLE */
    sem_destroy(&dlt_mutex);

    /* allow the user app to do dlt_init() again. */
    /* The flag is unset only to keep almost the same behaviour as before, on EntryNav */
    /* This should be removed for other projects (see documentation of dlt_free() */
    dlt_user_freeing = 0;

    return DLT_RETURN_OK;
}

DltReturnValue dlt_check_library_version(const char *user_major_version, const char *user_minor_version)
{
    return dlt_user_check_library_version(user_major_version, user_minor_version);
}

DltReturnValue dlt_register_app(const char *apid, const char *description)
{
    DltReturnValue ret = DLT_RETURN_OK;

    /* forbid dlt usage in child after fork */
    if (g_dlt_is_child)
        return DLT_RETURN_ERROR;

    if (!dlt_user_initialised) {
        if (dlt_init() < 0) {
            dlt_vlog(LOG_ERR, "%s Failed to initialise dlt", __FUNCTION__);
            return DLT_RETURN_ERROR;
        }
    }

    if ((apid == NULL) || (apid[0] == '\0'))
        return DLT_RETURN_WRONG_PARAMETER;

    /* check if application already registered */
    /* if yes do not register again */
    if (apid[1] == 0) {
        if (apid[0] == dlt_user.appID[0])
            return DLT_RETURN_OK;
    }
    else if (apid[2] == 0)
    {
        if ((apid[0] == dlt_user.appID[0]) &&
            (apid[1] == dlt_user.appID[1]))
            return DLT_RETURN_OK;
    }
    else if (apid[3] == 0)
    {
        if ((apid[0] == dlt_user.appID[0]) &&
            (apid[1] == dlt_user.appID[1]) &&
            (apid[2] == dlt_user.appID[2]))
            return DLT_RETURN_OK;
    }
    else if ((apid[0] == dlt_user.appID[0]) &&
             (apid[1] == dlt_user.appID[1]) &&
             (apid[2] == dlt_user.appID[2]) &&
             (apid[3] == dlt_user.appID[3]))
    {
        return DLT_RETURN_OK;
    }

    DLT_SEM_LOCK();

    /* Store locally application id and application description */
    dlt_set_id(dlt_user.appID, apid);

    if (dlt_user.application_description != NULL)
        free(dlt_user.application_description);

    dlt_user.application_description = NULL;

    if (description != NULL) {
        size_t desc_len = strlen(description);
        dlt_user.application_description = malloc(desc_len + 1);

        if (dlt_user.application_description) {
            strncpy(dlt_user.application_description, description, desc_len + 1);
        } else {
            DLT_SEM_FREE();
            return DLT_RETURN_ERROR;
        }
    }

    DLT_SEM_FREE();

    ret = dlt_user_log_send_register_application();

    if ((ret == DLT_RETURN_OK) && (dlt_user.dlt_log_handle != -1))
        ret = dlt_user_log_resend_buffer();

    return ret;
}

DltReturnValue dlt_register_context(DltContext *handle, const char *contextid, const char *description)
{
    /* check nullpointer */
    if (handle == NULL)
        return DLT_RETURN_WRONG_PARAMETER;

    /* forbid dlt usage in child after fork */
    if (g_dlt_is_child)
        return DLT_RETURN_ERROR;

    if (!dlt_user_initialised) {
        if (dlt_init() < 0) {
            dlt_vlog(LOG_ERR, "%s Failed to initialise dlt", __FUNCTION__);
            return DLT_RETURN_ERROR;
        }
    }

    if ((contextid == NULL) || (contextid[0] == '\0'))
        return DLT_RETURN_WRONG_PARAMETER;

    return dlt_register_context_ll_ts(handle,
                                      contextid,
                                      description,
                                      DLT_USER_LOG_LEVEL_NOT_SET,
                                      DLT_USER_TRACE_STATUS_NOT_SET);
}

DltReturnValue dlt_register_context_ll_ts_llccb(DltContext *handle,
                                                const char *contextid,
                                                const char *description,
                                                int loglevel,
                                                int tracestatus,
                                                void (*dlt_log_level_changed_callback)(char context_id[DLT_ID_SIZE],
                                                                                       uint8_t log_level,
                                                                                       uint8_t trace_status))
{
    DltContextData log;
    uint32_t i;
    int envLogLevel = DLT_USER_LOG_LEVEL_NOT_SET;

    /*check nullpointer */
    if ((handle == NULL) || (contextid == NULL) || (contextid[0] == '\0'))
        return DLT_RETURN_WRONG_PARAMETER;

    /* forbid dlt usage in child after fork */
    if (g_dlt_is_child)
        return DLT_RETURN_ERROR;

    if ((loglevel < DLT_USER_LOG_LEVEL_NOT_SET) || (loglevel >= DLT_LOG_MAX)) {
        dlt_vlog(LOG_ERR, "Loglevel %d is outside valid range", loglevel);
        return DLT_RETURN_WRONG_PARAMETER;
    }

    if ((tracestatus < DLT_USER_TRACE_STATUS_NOT_SET) || (tracestatus >= DLT_TRACE_STATUS_MAX)) {
        dlt_vlog(LOG_ERR, "Tracestatus %d is outside valid range", tracestatus);
        return DLT_RETURN_WRONG_PARAMETER;
    }

    if (dlt_user_log_init(handle, &log) < DLT_RETURN_OK)
        return DLT_RETURN_ERROR;

    /* Reset message counter */
    handle->mcnt = 0;

    /* Store context id in log level/trace status field */

    /* Check if already registered, else register context */
    DLT_SEM_LOCK();

    /* Check of double context registration removed */
    /* Double registration is already checked by daemon */

    /* Allocate or expand context array */
    if (dlt_user.dlt_ll_ts == NULL) {
        dlt_user.dlt_ll_ts = (dlt_ll_ts_type *)malloc(sizeof(dlt_ll_ts_type) * DLT_USER_CONTEXT_ALLOC_SIZE);

        if (dlt_user.dlt_ll_ts == NULL) {
            DLT_SEM_FREE();
            return DLT_RETURN_ERROR;
        }

        dlt_user.dlt_ll_ts_max_num_entries = DLT_USER_CONTEXT_ALLOC_SIZE;

        /* Initialize new entries */
        for (i = 0; i < dlt_user.dlt_ll_ts_max_num_entries; i++) {
            dlt_set_id(dlt_user.dlt_ll_ts[i].contextID, "");

            /* At startup, logging and tracing is locally enabled */
            /* the correct log level/status is set after received from daemon */
            dlt_user.dlt_ll_ts[i].log_level = DLT_USER_INITIAL_LOG_LEVEL;
            dlt_user.dlt_ll_ts[i].trace_status = DLT_USER_INITIAL_TRACE_STATUS;

            dlt_user.dlt_ll_ts[i].log_level_ptr = 0;
            dlt_user.dlt_ll_ts[i].trace_status_ptr = 0;

            dlt_user.dlt_ll_ts[i].context_description = 0;

            dlt_user.dlt_ll_ts[i].injection_table = 0;
            dlt_user.dlt_ll_ts[i].nrcallbacks = 0;
            dlt_user.dlt_ll_ts[i].log_level_changed_callback = 0;
        }
    }
    else if ((dlt_user.dlt_ll_ts_num_entries % DLT_USER_CONTEXT_ALLOC_SIZE) == 0)
    {
        /* allocate memory in steps of DLT_USER_CONTEXT_ALLOC_SIZE, e.g. 500 */
        dlt_ll_ts_type *old_ll_ts;
        uint32_t old_max_entries;

        old_ll_ts = dlt_user.dlt_ll_ts;
        old_max_entries = dlt_user.dlt_ll_ts_max_num_entries;

        dlt_user.dlt_ll_ts_max_num_entries = ((dlt_user.dlt_ll_ts_num_entries
                                               / DLT_USER_CONTEXT_ALLOC_SIZE) + 1)
            * DLT_USER_CONTEXT_ALLOC_SIZE;
        dlt_user.dlt_ll_ts = (dlt_ll_ts_type *)malloc(sizeof(dlt_ll_ts_type) *
                                                      dlt_user.dlt_ll_ts_max_num_entries);

        if (dlt_user.dlt_ll_ts == NULL) {
            dlt_user.dlt_ll_ts = old_ll_ts;
            dlt_user.dlt_ll_ts_max_num_entries = old_max_entries;
            DLT_SEM_FREE();
            return DLT_RETURN_ERROR;
        }

        memcpy(dlt_user.dlt_ll_ts, old_ll_ts, sizeof(dlt_ll_ts_type) * dlt_user.dlt_ll_ts_num_entries);
        free(old_ll_ts);

        /* Initialize new entries */
        for (i = dlt_user.dlt_ll_ts_num_entries; i < dlt_user.dlt_ll_ts_max_num_entries; i++) {
            dlt_set_id(dlt_user.dlt_ll_ts[i].contextID, "");

            /* At startup, logging and tracing is locally enabled */
            /* the correct log level/status is set after received from daemon */
            dlt_user.dlt_ll_ts[i].log_level = DLT_USER_INITIAL_LOG_LEVEL;
            dlt_user.dlt_ll_ts[i].trace_status = DLT_USER_INITIAL_TRACE_STATUS;

            dlt_user.dlt_ll_ts[i].log_level_ptr = 0;
            dlt_user.dlt_ll_ts[i].trace_status_ptr = 0;

            dlt_user.dlt_ll_ts[i].context_description = 0;

            dlt_user.dlt_ll_ts[i].injection_table = 0;
            dlt_user.dlt_ll_ts[i].nrcallbacks = 0;
            dlt_user.dlt_ll_ts[i].log_level_changed_callback = 0;
        }
    }

    /* New context entry to be initialized */
    dlt_ll_ts_type *ctx_entry;
    ctx_entry = &dlt_user.dlt_ll_ts[dlt_user.dlt_ll_ts_num_entries];

    /* Store locally context id and context description */
    dlt_set_id(ctx_entry->contextID, contextid);

    if (ctx_entry->context_description != 0)
        free(ctx_entry->context_description);

    ctx_entry->context_description = 0;

    if (description != 0) {
        size_t desc_len = strlen(description);
        ctx_entry->context_description = malloc(desc_len + 1);

        if (ctx_entry->context_description == 0) {
            DLT_SEM_FREE();
            return DLT_RETURN_ERROR;
        }

        strncpy(ctx_entry->context_description, description, desc_len + 1);
    }

    if (ctx_entry->log_level_ptr == 0) {
        ctx_entry->log_level_ptr = malloc(sizeof(int8_t));

        if (ctx_entry->log_level_ptr == 0) {
            DLT_SEM_FREE();
            return DLT_RETURN_ERROR;
        }
    }

    if (ctx_entry->trace_status_ptr == 0) {
        ctx_entry->trace_status_ptr = malloc(sizeof(int8_t));

        if (ctx_entry->trace_status_ptr == 0) {
            DLT_SEM_FREE();
            return DLT_RETURN_ERROR;
        }
    }

    /* check if the log level is set in the environement */
    envLogLevel = dlt_env_adjust_ll_from_env(&dlt_user.initial_ll_set,
                                             dlt_user.appID,
                                             contextid,
                                             DLT_USER_LOG_LEVEL_NOT_SET);

    if (envLogLevel != DLT_USER_LOG_LEVEL_NOT_SET) {
        ctx_entry->log_level = (int8_t) envLogLevel;
        loglevel = envLogLevel;
    }
    else if (loglevel != DLT_USER_LOG_LEVEL_NOT_SET)
    {
        ctx_entry->log_level = (int8_t) loglevel;
    }

    if (tracestatus != DLT_USER_TRACE_STATUS_NOT_SET)
        ctx_entry->trace_status = (int8_t) tracestatus;

    /* Prepare transfer struct */
    dlt_set_id(handle->contextID, contextid);
    handle->log_level_pos = (int32_t) dlt_user.dlt_ll_ts_num_entries;

    handle->log_level_ptr = ctx_entry->log_level_ptr;
    handle->trace_status_ptr = ctx_entry->trace_status_ptr;

    log.context_description = ctx_entry->context_description;

    *(ctx_entry->log_level_ptr) = ctx_entry->log_level;
    *(ctx_entry->trace_status_ptr) = ctx_entry->trace_status = (int8_t) tracestatus;
    ctx_entry->log_level_changed_callback = dlt_log_level_changed_callback;

    log.log_level = loglevel;
    log.trace_status = tracestatus;

    dlt_user.dlt_ll_ts_num_entries++;

    DLT_SEM_FREE();

    return dlt_user_log_send_register_context(&log);
}

DltReturnValue dlt_register_context_ll_ts(DltContext *handle,
                                          const char *contextid,
                                          const char *description,
                                          int loglevel,
                                          int tracestatus)
{
    return dlt_register_context_ll_ts_llccb(handle,
                                            contextid,
                                            description,
                                            loglevel,
                                            tracestatus,
                                            NULL);

}

DltReturnValue dlt_register_context_llccb(DltContext *handle,
                                          const char *contextid,
                                          const char *description,
                                          void (*dlt_log_level_changed_callback)(char context_id[DLT_ID_SIZE],
                                                                                 uint8_t log_level,
                                                                                 uint8_t trace_status))
{
    if ((handle == NULL) || (contextid == NULL) || (contextid[0] == '\0'))
        return DLT_RETURN_WRONG_PARAMETER;

    /* forbid dlt usage in child after fork */
    if (g_dlt_is_child)
        return DLT_RETURN_ERROR;

    if (!dlt_user_initialised) {
        if (dlt_init() < 0) {
            dlt_vlog(LOG_ERR, "%s Failed to initialise dlt", __FUNCTION__);
            return DLT_RETURN_ERROR;
        }
    }

    return dlt_register_context_ll_ts_llccb(handle,
                                            contextid,
                                            description,
                                            DLT_USER_LOG_LEVEL_NOT_SET,
                                            DLT_USER_TRACE_STATUS_NOT_SET,
                                            dlt_log_level_changed_callback);
}

/* If force_sending_messages is set to true, do not clean appIDs when there are
 * still data in startup_buffer. atexit_handler will free the appIDs */
DltReturnValue dlt_unregister_app_util(bool force_sending_messages)
{
    DltReturnValue ret = DLT_RETURN_OK;

    /* forbid dlt usage in child after fork */
    if (g_dlt_is_child)
        return DLT_RETURN_ERROR;

    if (!dlt_user_initialised) {
        dlt_vlog(LOG_WARNING, "%s dlt_user_initialised false\n", __FUNCTION__);
        return DLT_RETURN_ERROR;
    }

    /* Inform daemon to unregister application and all of its contexts */
    ret = dlt_user_log_send_unregister_application();

    DLT_SEM_LOCK();

    int count = dlt_buffer_get_message_count(&(dlt_user.startup_buffer));
    if (!force_sending_messages ||
        (force_sending_messages && count == 0))
    {
        /* Clear and free local stored application information */
        dlt_set_id(dlt_user.appID, "");

        if (dlt_user.application_description != NULL)
            free(dlt_user.application_description);

        dlt_user.application_description = NULL;
    }

    DLT_SEM_FREE();

    return ret;
}

DltReturnValue dlt_unregister_app(void)
{
    return dlt_unregister_app_util(false);
}

DltReturnValue dlt_unregister_app_flush_buffered_logs(void)
{
    DltReturnValue ret = DLT_RETURN_OK;

    /* forbid dlt usage in child after fork */
    if (g_dlt_is_child)
        return DLT_RETURN_ERROR;

    if (!dlt_user_initialised) {
        dlt_vlog(LOG_ERR, "%s dlt_user_initialised false\n", __func__);
        return DLT_RETURN_ERROR;
    }

    if (dlt_user.dlt_log_handle != -1) {
        do
            ret = dlt_user_log_resend_buffer();
        while ((ret != DLT_RETURN_OK) && (dlt_user.dlt_log_handle != -1));
    }

    return dlt_unregister_app_util(true);
}

DltReturnValue dlt_unregister_context(DltContext *handle)
{
    DltContextData log;
    DltReturnValue ret = DLT_RETURN_OK;

    /* forbid dlt usage in child after fork */
    if (g_dlt_is_child)
        return DLT_RETURN_ERROR;

    log.handle = NULL;
    log.context_description = NULL;

    if (dlt_user_log_init(handle, &log) <= DLT_RETURN_ERROR)
        return DLT_RETURN_ERROR;

    DLT_SEM_LOCK();

    handle->log_level_ptr = NULL;
    handle->trace_status_ptr = NULL;

    if (dlt_user.dlt_ll_ts != NULL) {
        /* Clear and free local stored context information */
        dlt_set_id(dlt_user.dlt_ll_ts[handle->log_level_pos].contextID, "");

        dlt_user.dlt_ll_ts[handle->log_level_pos].log_level = DLT_USER_INITIAL_LOG_LEVEL;
        dlt_user.dlt_ll_ts[handle->log_level_pos].trace_status = DLT_USER_INITIAL_TRACE_STATUS;

        if (dlt_user.dlt_ll_ts[handle->log_level_pos].context_description != NULL)
            free(dlt_user.dlt_ll_ts[handle->log_level_pos].context_description);

        if (dlt_user.dlt_ll_ts[handle->log_level_pos].log_level_ptr != NULL) {
            free(dlt_user.dlt_ll_ts[handle->log_level_pos].log_level_ptr);
            dlt_user.dlt_ll_ts[handle->log_level_pos].log_level_ptr = NULL;
        }

        if (dlt_user.dlt_ll_ts[handle->log_level_pos].trace_status_ptr != NULL) {
            free(dlt_user.dlt_ll_ts[handle->log_level_pos].trace_status_ptr);
            dlt_user.dlt_ll_ts[handle->log_level_pos].trace_status_ptr = NULL;
        }

        dlt_user.dlt_ll_ts[handle->log_level_pos].context_description = NULL;

        if (dlt_user.dlt_ll_ts[handle->log_level_pos].injection_table != NULL) {
            free(dlt_user.dlt_ll_ts[handle->log_level_pos].injection_table);
            dlt_user.dlt_ll_ts[handle->log_level_pos].injection_table = NULL;
        }

        dlt_user.dlt_ll_ts[handle->log_level_pos].nrcallbacks = 0;
        dlt_user.dlt_ll_ts[handle->log_level_pos].log_level_changed_callback = 0;
    }

    DLT_SEM_FREE();

    /* Inform daemon to unregister context */
    ret = dlt_user_log_send_unregister_context(&log);

    return ret;
}

DltReturnValue dlt_set_application_ll_ts_limit(DltLogLevelType loglevel, DltTraceStatusType tracestatus)
{
    uint32_t i;

    /* forbid dlt usage in child after fork */
    if (g_dlt_is_child)
        return DLT_RETURN_ERROR;

    if ((loglevel < DLT_USER_LOG_LEVEL_NOT_SET) || (loglevel >= DLT_LOG_MAX)) {
        dlt_vlog(LOG_ERR, "Loglevel %d is outside valid range", loglevel);
        return DLT_RETURN_WRONG_PARAMETER;
    }

    if ((tracestatus < DLT_USER_TRACE_STATUS_NOT_SET) || (tracestatus >= DLT_TRACE_STATUS_MAX)) {
        dlt_vlog(LOG_ERR, "Tracestatus %d is outside valid range", tracestatus);
        return DLT_RETURN_WRONG_PARAMETER;
    }

    if (!dlt_user_initialised) {
        if (dlt_init() < 0) {
            dlt_vlog(LOG_ERR, "%s Failed to initialise dlt", __FUNCTION__);
            return DLT_RETURN_ERROR;
        }
    }

    DLT_SEM_LOCK();

    if (dlt_user.dlt_ll_ts == NULL) {
        DLT_SEM_FREE();
        return DLT_RETURN_ERROR;
    }

    /* Update local structures */
    for (i = 0; i < dlt_user.dlt_ll_ts_num_entries; i++) {
        dlt_user.dlt_ll_ts[i].log_level = loglevel;
        dlt_user.dlt_ll_ts[i].trace_status = tracestatus;

        if (dlt_user.dlt_ll_ts[i].log_level_ptr)
            *(dlt_user.dlt_ll_ts[i].log_level_ptr) = loglevel;

        if (dlt_user.dlt_ll_ts[i].trace_status_ptr)
            *(dlt_user.dlt_ll_ts[i].trace_status_ptr) = tracestatus;
    }

    DLT_SEM_FREE();

    /* Inform DLT server about update */
    return dlt_send_app_ll_ts_limit(dlt_user.appID, loglevel, tracestatus);
}

int dlt_get_log_state()
{
    return dlt_user.log_state;
}

DltReturnValue dlt_set_log_mode(DltUserLogMode mode)
{
    DLT_UNUSED(mode);

    /* forbid dlt usage in child after fork */
    if (g_dlt_is_child)
        return DLT_RETURN_ERROR;

    if ((mode < DLT_USER_MODE_UNDEFINED) || (mode >= DLT_USER_MODE_MAX)) {
        dlt_vlog(LOG_ERR, "User log mode %d is outside valid range", mode);
        return DLT_RETURN_WRONG_PARAMETER;
    }

    if (!dlt_user_initialised) {
        if (dlt_init() < 0) {
            dlt_vlog(LOG_ERR, "%s Failed to initialise dlt", __FUNCTION__);
            return DLT_RETURN_ERROR;
        }
    }

    return dlt_user_log_send_log_mode(mode);
}

int dlt_set_resend_timeout_atexit(uint32_t timeout_in_milliseconds)
{
    /* forbid dlt usage in child after fork */
    if (g_dlt_is_child)
        return DLT_RETURN_ERROR;

    if (dlt_user_initialised == 0)
        if (dlt_init() < 0)
            return -1;

    dlt_user.timeout_at_exit_handler = timeout_in_milliseconds * 10;
    return 0;
}

/* ********************************************************************************************* */

DltReturnValue dlt_user_log_write_start_init(DltContext *handle,
                                                    DltContextData *log,
                                                    DltLogLevelType loglevel,
                                                    bool is_verbose)
{
    DLT_LOG_FATAL_RESET_TRAP(loglevel);

    /* initialize values */
    if ((dlt_user_log_init(handle, log) < DLT_RETURN_OK) || (dlt_user.dlt_ll_ts == NULL))
        return DLT_RETURN_ERROR;

    log->args_num = 0;
    log->log_level = loglevel;
    log->size = 0;
    log->use_timestamp = DLT_AUTO_TIMESTAMP;
    log->verbose_mode = is_verbose;

    return DLT_RETURN_TRUE;
}

static DltReturnValue dlt_user_log_write_start_internal(DltContext *handle,
                                                        DltContextData *log,
                                                        DltLogLevelType loglevel,
                                                        uint32_t messageid,
                                                        bool is_verbose);

inline DltReturnValue dlt_user_log_write_start(DltContext *handle, DltContextData *log, DltLogLevelType loglevel)
{
    return dlt_user_log_write_start_internal(handle, log, loglevel, DLT_USER_DEFAULT_MSGID, true);
}

DltReturnValue dlt_user_log_write_start_id(DltContext *handle,
                                           DltContextData *log,
                                           DltLogLevelType loglevel,
                                           uint32_t messageid)
{
    return dlt_user_log_write_start_internal(handle, log, loglevel, messageid, false);
}

DltReturnValue dlt_user_log_write_start_internal(DltContext *handle,
                                           DltContextData *log,
                                           DltLogLevelType loglevel,
                                           uint32_t messageid,
                                           bool is_verbose)
{
    int ret = DLT_RETURN_TRUE;

    /* check nullpointer */
    if ((handle == NULL) || (log == NULL))
        return DLT_RETURN_WRONG_PARAMETER;

    /* forbid dlt usage in child after fork */
    if (g_dlt_is_child)
        return DLT_RETURN_ERROR;

    /* check log levels */
    ret = dlt_user_is_logLevel_enabled(handle, loglevel);

    if (ret == DLT_RETURN_WRONG_PARAMETER) {
        return DLT_RETURN_WRONG_PARAMETER;
    } else if (ret == DLT_RETURN_LOGGING_DISABLED) {
        log->handle = NULL;
        return DLT_RETURN_OK;
    }

    ret = dlt_user_log_write_start_init(handle, log, loglevel, is_verbose);
    if (ret == DLT_RETURN_TRUE) {
        /* initialize values */
        if (log->buffer == NULL) {
            log->buffer = calloc(sizeof(unsigned char), dlt_user.log_buf_len);

            if (log->buffer == NULL) {
                dlt_vlog(LOG_ERR, "Cannot allocate buffer for DLT Log message\n");
                return DLT_RETURN_ERROR;
            }
        }

        /* In non-verbose mode, insert message id */
        if (!is_verbose_mode(dlt_user.verbose_mode, log)) {
            if ((sizeof(uint32_t)) > dlt_user.log_buf_len) {
                return DLT_RETURN_USER_BUFFER_FULL;
            }

            /* Write message id */
            memcpy(log->buffer, &(messageid), sizeof(uint32_t));
            log->size = sizeof(uint32_t);

            /* as the message id is part of each message in non-verbose mode,
             * it doesn't increment the argument counter in extended header (if used) */
        }
    }

    return ret;
}

DltReturnValue dlt_user_log_write_start_w_given_buffer(DltContext *handle,
                                                       DltContextData *log,
                                                       DltLogLevelType loglevel,
                                                       char *buffer,
                                                       size_t size,
                                                       int32_t args_num)
{
    int ret = DLT_RETURN_TRUE;

    /* check nullpointer */
    if ((handle == NULL) || (log == NULL) || (buffer == NULL))
        return DLT_RETURN_WRONG_PARAMETER;

    /* discard unexpected parameters */
    if ((size <= 0) || (size > dlt_user.log_buf_len) || (args_num <= 0))
        return DLT_RETURN_WRONG_PARAMETER;

    /* forbid dlt usage in child after fork */
    if (g_dlt_is_child)
        return DLT_RETURN_ERROR;

    /* discard non-verbose mode */
    if (dlt_user.verbose_mode == 0)
        return DLT_RETURN_ERROR;

    ret = dlt_user_log_write_start_init(handle, log, loglevel, true);
    if (ret == DLT_RETURN_TRUE) {
        log->buffer = (unsigned char *)buffer;
        log->size = size;
        log->args_num = args_num;
    }

    return ret;
 }
 
DltReturnValue dlt_user_log_write_finish(DltContextData *log)
{
    int ret = DLT_RETURN_ERROR;

    if (log == NULL)
        return DLT_RETURN_WRONG_PARAMETER;

    ret = dlt_user_log_send_log(log, DLT_TYPE_LOG);

    dlt_user_free_buffer(&(log->buffer));

    return ret;
}

DltReturnValue dlt_user_log_write_finish_w_given_buffer(DltContextData *log)
{
    int ret = DLT_RETURN_ERROR;

    if (log == NULL)
        return DLT_RETURN_WRONG_PARAMETER;

    ret = dlt_user_log_send_log(log, DLT_TYPE_LOG);

    return ret;
}

static DltReturnValue dlt_user_log_write_raw_internal(DltContextData *log, const void *data, uint16_t length, DltFormatType type, const char *name, bool with_var_info)
{
    /* check nullpointer */
    if ((log == NULL) || ((data == NULL) && (length != 0)))
        return DLT_RETURN_WRONG_PARAMETER;

    /* Have to cast type to signed type because some compilers assume that DltFormatType is unsigned and issue a warning */
    if (((int16_t)type < DLT_FORMAT_DEFAULT) || (type >= DLT_FORMAT_MAX)) {
        dlt_vlog(LOG_ERR, "Format type %u is outside valid range", type);
        return DLT_RETURN_WRONG_PARAMETER;
    }

    if (!dlt_user_initialised) {
        dlt_vlog(LOG_WARNING, "%s dlt_user_initialised false\n", __FUNCTION__);
        return DLT_RETURN_ERROR;
    }

    const uint16_t name_size = (name != NULL) ? strlen(name)+1 : 0;

    size_t needed_size = length + sizeof(uint16_t);
    if ((log->size + needed_size) > dlt_user.log_buf_len)
        return DLT_RETURN_USER_BUFFER_FULL;

    if (is_verbose_mode(dlt_user.verbose_mode, log)) {
        uint32_t type_info = DLT_TYPE_INFO_RAWD;

        needed_size += sizeof(uint32_t);  // Type Info field
        if (with_var_info) {
            needed_size += sizeof(uint16_t);  // length of name
            needed_size += name_size;  // the name itself

            type_info |= DLT_TYPE_INFO_VARI;
        }
        if ((log->size + needed_size) > dlt_user.log_buf_len)
            return DLT_RETURN_USER_BUFFER_FULL;

        // Genivi extension: put formatting hints into the unused (for RAWD) TYLE + SCOD fields.
        // The SCOD field holds the base (hex or bin); the TYLE field holds the column width (8bit..64bit).
        if ((type >= DLT_FORMAT_HEX8) && (type <= DLT_FORMAT_HEX64)) {
            type_info |= DLT_SCOD_HEX;
            type_info += type;
        }
        else if ((type >= DLT_FORMAT_BIN8) && (type <= DLT_FORMAT_BIN16))
        {
            type_info |= DLT_SCOD_BIN;
            type_info += type - DLT_FORMAT_BIN8 + 1;
        }

        memcpy(log->buffer + log->size, &type_info, sizeof(uint32_t));
        log->size += sizeof(uint32_t);
    }

    memcpy(log->buffer + log->size, &length, sizeof(uint16_t));
    log->size += sizeof(uint16_t);

    if (is_verbose_mode(dlt_user.verbose_mode, log)) {
        if (with_var_info) {
            // Write length of "name" attribute.
            // We assume that the protocol allows zero-sized strings here (which this code will create
            // when the input pointer is NULL).
            memcpy(log->buffer + log->size, &name_size, sizeof(uint16_t));
            log->size += sizeof(uint16_t);

            // Write name string itself.
            // Must not use NULL as source pointer for memcpy. This check assures that.
            if (name_size != 0) {
                memcpy(log->buffer + log->size, name, name_size);
                log->size += name_size;
            }
        }
    }

    memcpy(log->buffer + log->size, data, length);
    log->size += length;

    log->args_num++;

    return DLT_RETURN_OK;
}

DltReturnValue dlt_user_log_write_raw(DltContextData *log, void *data, uint16_t length)
{
    return dlt_user_log_write_raw_internal(log, data, length, DLT_FORMAT_DEFAULT, NULL, false);
}

DltReturnValue dlt_user_log_write_raw_formatted(DltContextData *log, void *data, uint16_t length, DltFormatType type)
{
    return dlt_user_log_write_raw_internal(log, data, length, type, NULL, false);
}

DltReturnValue dlt_user_log_write_raw_attr(DltContextData *log, const void *data, uint16_t length, const char *name)
{
    return dlt_user_log_write_raw_internal(log, data, length, DLT_FORMAT_DEFAULT, name, true);
}

DltReturnValue dlt_user_log_write_raw_formatted_attr(DltContextData *log, const void *data, uint16_t length, DltFormatType type, const char *name)
{
    return dlt_user_log_write_raw_internal(log, data, length, type, name, true);
}

// Generic implementation for all "simple" types, possibly with attributes
static DltReturnValue dlt_user_log_write_generic_attr(DltContextData *log, const void *datap, size_t datalen, uint32_t type_info, const VarInfo *varinfo)
{
    if (log == NULL)
        return DLT_RETURN_WRONG_PARAMETER;

    if (!dlt_user_initialised) {
        dlt_vlog(LOG_WARNING, "%s dlt_user_initialised false\n", __FUNCTION__);
        return DLT_RETURN_ERROR;
    }

    size_t needed_size = datalen;
    if ((log->size + needed_size) > dlt_user.log_buf_len)
        return DLT_RETURN_USER_BUFFER_FULL;

    if (is_verbose_mode(dlt_user.verbose_mode, log)) {
        bool with_var_info = (varinfo != NULL);

        uint16_t name_size;
        uint16_t unit_size;

        needed_size += sizeof(uint32_t);  // Type Info field
        if (with_var_info) {
            name_size = (varinfo->name != NULL) ? strlen(varinfo->name)+1 : 0;
            unit_size = (varinfo->unit != NULL) ? strlen(varinfo->unit)+1 : 0;

            needed_size += sizeof(uint16_t);      // length of name
            needed_size += name_size;             // the name itself
            if (varinfo->with_unit) {
                needed_size += sizeof(uint16_t);  // length of unit
                needed_size += unit_size;         // the unit itself
            }

            type_info |= DLT_TYPE_INFO_VARI;
        }
        if ((log->size + needed_size) > dlt_user.log_buf_len)
            return DLT_RETURN_USER_BUFFER_FULL;

        memcpy(log->buffer + log->size, &type_info, sizeof(uint32_t));
        log->size += sizeof(uint32_t);

        if (with_var_info) {
            // Write lengths of name/unit strings
            // We assume here that the protocol allows zero-sized strings here (which occur
            // when the input pointers are NULL).
            memcpy(log->buffer + log->size, &name_size, sizeof(uint16_t));
            log->size += sizeof(uint16_t);
            if (varinfo->with_unit) {
                memcpy(log->buffer + log->size, &unit_size, sizeof(uint16_t));
                log->size += sizeof(uint16_t);
            }

            // Write name/unit strings themselves
            // Must not use NULL as source pointer for memcpy.
            if (name_size != 0) {
                memcpy(log->buffer + log->size, varinfo->name, name_size);
                log->size += name_size;
            }
            if (unit_size != 0) {
                memcpy(log->buffer + log->size, varinfo->unit, unit_size);
                log->size += unit_size;
            }
        }
    }

    memcpy(log->buffer + log->size, datap, datalen);
    log->size += datalen;

    log->args_num++;

    return DLT_RETURN_OK;
}

// Generic implementation for all "simple" types
static DltReturnValue dlt_user_log_write_generic_formatted(DltContextData *log, const void *datap, size_t datalen, uint32_t type_info, DltFormatType type)
{
    if (log == NULL)
        return DLT_RETURN_WRONG_PARAMETER;

    /* Have to cast type to signed type because some compilers assume that DltFormatType is unsigned and issue a warning */
    if (((int16_t)type < DLT_FORMAT_DEFAULT) || (type >= DLT_FORMAT_MAX)) {
        dlt_vlog(LOG_ERR, "Format type %d is outside valid range", type);
        return DLT_RETURN_WRONG_PARAMETER;
    }

    if (!dlt_user_initialised) {
        dlt_vlog(LOG_WARNING, "%s dlt_user_initialised false\n", __FUNCTION__);
        return DLT_RETURN_ERROR;
    }

    size_t needed_size = datalen;
    if ((log->size + needed_size) > dlt_user.log_buf_len)
        return DLT_RETURN_USER_BUFFER_FULL;

    if (is_verbose_mode(dlt_user.verbose_mode, log)) {
        needed_size += sizeof(uint32_t);  // Type Info field
        if ((log->size + needed_size) > dlt_user.log_buf_len)
            return DLT_RETURN_USER_BUFFER_FULL;

        // Genivi extension: put formatting hints into the unused (for SINT/UINT/FLOA) SCOD field.
        if ((type >= DLT_FORMAT_HEX8) && (type <= DLT_FORMAT_HEX64))
            type_info |= DLT_SCOD_HEX;

        else if ((type >= DLT_FORMAT_BIN8) && (type <= DLT_FORMAT_BIN16))
            type_info |= DLT_SCOD_BIN;

        memcpy(log->buffer + log->size, &type_info, sizeof(uint32_t));
        log->size += sizeof(uint32_t);
    }

    memcpy(log->buffer + log->size, datap, datalen);
    log->size += datalen;

    log->args_num++;

    return DLT_RETURN_OK;
}

DltReturnValue dlt_user_log_write_float32(DltContextData *log, float32_t data)
{
    if (sizeof(float32_t) != 4)
        return DLT_RETURN_ERROR;

    uint32_t type_info = DLT_TYPE_INFO_FLOA | DLT_TYLE_32BIT;
    return dlt_user_log_write_generic_attr(log, &data, sizeof(float32_t), type_info, NULL);
}

DltReturnValue dlt_user_log_write_float64(DltContextData *log, float64_t data)
{
    if (sizeof(float64_t) != 8)
        return DLT_RETURN_ERROR;

    uint32_t type_info = DLT_TYPE_INFO_FLOA | DLT_TYLE_64BIT;
    return dlt_user_log_write_generic_attr(log, &data, sizeof(float64_t), type_info, NULL);
}

DltReturnValue dlt_user_log_write_float32_attr(DltContextData *log, float32_t data, const char *name, const char *unit)
{
    if (sizeof(float32_t) != 4)
        return DLT_RETURN_ERROR;

    uint32_t type_info = DLT_TYPE_INFO_FLOA | DLT_TYLE_32BIT;
    const VarInfo var_info = { name, unit, true };
    return dlt_user_log_write_generic_attr(log, &data, sizeof(float32_t), type_info, &var_info);
}

DltReturnValue dlt_user_log_write_float64_attr(DltContextData *log, float64_t data, const char *name, const char *unit)
{
    if (sizeof(float64_t) != 8)
        return DLT_RETURN_ERROR;

    uint32_t type_info = DLT_TYPE_INFO_FLOA | DLT_TYLE_64BIT;
    const VarInfo var_info = { name, unit, true };
    return dlt_user_log_write_generic_attr(log, &data, sizeof(float64_t), type_info, &var_info);
}

DltReturnValue dlt_user_log_write_uint_attr(DltContextData *log, unsigned int data, const char *name, const char *unit)
{
    if (log == NULL)
        return DLT_RETURN_WRONG_PARAMETER;

    if (!dlt_user_initialised) {
        dlt_vlog(LOG_WARNING, "%s dlt_user_initialised false\n", __FUNCTION__);
        return DLT_RETURN_ERROR;
    }

    switch (sizeof(unsigned int)) {
    case 1:
    {
        return dlt_user_log_write_uint8_attr(log, (uint8_t)data, name, unit);
        break;
    }
    case 2:
    {
        return dlt_user_log_write_uint16_attr(log, (uint16_t)data, name, unit);
        break;
    }
    case 4:
    {
        return dlt_user_log_write_uint32_attr(log, (uint32_t)data, name, unit);
        break;
    }
    case 8:
    {
        return dlt_user_log_write_uint64_attr(log, (uint64_t)data, name, unit);
        break;
    }
    default:
    {
        return DLT_RETURN_ERROR;
        break;
    }
    }

    return DLT_RETURN_OK;
}

DltReturnValue dlt_user_log_write_uint8(DltContextData *log, uint8_t data)
{
    uint32_t type_info = DLT_TYPE_INFO_UINT | DLT_TYLE_8BIT;
    return dlt_user_log_write_generic_attr(log, &data, sizeof(uint8_t), type_info, NULL);
}

DltReturnValue dlt_user_log_write_uint16(DltContextData *log, uint16_t data)
{
    uint32_t type_info = DLT_TYPE_INFO_UINT | DLT_TYLE_16BIT;
    return dlt_user_log_write_generic_attr(log, &data, sizeof(uint16_t), type_info, NULL);
}

DltReturnValue dlt_user_log_write_uint32(DltContextData *log, uint32_t data)
{
    uint32_t type_info = DLT_TYPE_INFO_UINT | DLT_TYLE_32BIT;
    return dlt_user_log_write_generic_attr(log, &data, sizeof(uint32_t), type_info, NULL);
}

DltReturnValue dlt_user_log_write_uint64(DltContextData *log, uint64_t data)
{
    uint32_t type_info = DLT_TYPE_INFO_UINT | DLT_TYLE_64BIT;
    return dlt_user_log_write_generic_attr(log, &data, sizeof(uint64_t), type_info, NULL);
}

DltReturnValue dlt_user_log_write_uint(DltContextData *log, unsigned int data)
{
    return dlt_user_log_write_uint_attr(log, data, NULL, NULL);
}

DltReturnValue dlt_user_log_write_uint8_attr(DltContextData *log, uint8_t data, const char *name, const char *unit)
{
    uint32_t type_info = DLT_TYPE_INFO_UINT | DLT_TYLE_8BIT;
    const VarInfo var_info = { name, unit, true };
    return dlt_user_log_write_generic_attr(log, &data, sizeof(uint8_t), type_info, &var_info);
}

DltReturnValue dlt_user_log_write_uint16_attr(DltContextData *log, uint16_t data, const char *name, const char *unit)
{
    uint32_t type_info = DLT_TYPE_INFO_UINT | DLT_TYLE_16BIT;
    const VarInfo var_info = { name, unit, true };
    return dlt_user_log_write_generic_attr(log, &data, sizeof(uint16_t), type_info, &var_info);
}

DltReturnValue dlt_user_log_write_uint32_attr(DltContextData *log, uint32_t data, const char *name, const char *unit)
{
    uint32_t type_info = DLT_TYPE_INFO_UINT | DLT_TYLE_32BIT;
    const VarInfo var_info = { name, unit, true };
    return dlt_user_log_write_generic_attr(log, &data, sizeof(uint32_t), type_info, &var_info);
}

DltReturnValue dlt_user_log_write_uint64_attr(DltContextData *log, uint64_t data, const char *name, const char *unit)
{
    uint32_t type_info = DLT_TYPE_INFO_UINT | DLT_TYLE_64BIT;
    const VarInfo var_info = { name, unit, true };
    return dlt_user_log_write_generic_attr(log, &data, sizeof(uint64_t), type_info, &var_info);
}

DltReturnValue dlt_user_log_write_uint8_formatted(DltContextData *log, uint8_t data, DltFormatType type)
{
    uint32_t type_info = DLT_TYPE_INFO_UINT | DLT_TYLE_8BIT;
    return dlt_user_log_write_generic_formatted(log, &data, sizeof(uint8_t), type_info, type);
}

DltReturnValue dlt_user_log_write_uint16_formatted(DltContextData *log, uint16_t data, DltFormatType type)
{
    uint32_t type_info = DLT_TYPE_INFO_UINT | DLT_TYLE_16BIT;
    return dlt_user_log_write_generic_formatted(log, &data, sizeof(uint16_t), type_info, type);
}

DltReturnValue dlt_user_log_write_uint32_formatted(DltContextData *log, uint32_t data, DltFormatType type)
{
    uint32_t type_info = DLT_TYPE_INFO_UINT | DLT_TYLE_32BIT;
    return dlt_user_log_write_generic_formatted(log, &data, sizeof(uint32_t), type_info, type);
}

DltReturnValue dlt_user_log_write_uint64_formatted(DltContextData *log, uint64_t data, DltFormatType type)
{
    uint32_t type_info = DLT_TYPE_INFO_UINT | DLT_TYLE_64BIT;
    return dlt_user_log_write_generic_formatted(log, &data, sizeof(uint64_t), type_info, type);
}

DltReturnValue dlt_user_log_write_ptr(DltContextData *log, void *data)
{
    if (log == NULL)
        return DLT_RETURN_WRONG_PARAMETER;

    if (!dlt_user_initialised) {
        dlt_vlog(LOG_WARNING, "%s user_initialised false\n", __FUNCTION__);
        return DLT_RETURN_ERROR;
    }

    switch (sizeof(void *)) {
    case 4:
        return dlt_user_log_write_uint32_formatted(log,
                                                   (uintptr_t) data,
                                                   DLT_FORMAT_HEX32);
        break;
    case 8:
        return dlt_user_log_write_uint64_formatted(log,
                                                   (uintptr_t) data,
                                                   DLT_FORMAT_HEX64);
        break;
    default:
        ;     /* skip */
    }

    return DLT_RETURN_OK;
}

DltReturnValue dlt_user_log_write_int_attr(DltContextData *log, int data, const char *name, const char *unit)
{
    if (log == NULL)
        return DLT_RETURN_WRONG_PARAMETER;

    if (!dlt_user_initialised) {
        dlt_vlog(LOG_WARNING, "%s dlt_user_initialised false\n", __FUNCTION__);
        return DLT_RETURN_ERROR;
    }

    switch (sizeof(int)) {
    case 1:
    {
        return dlt_user_log_write_int8_attr(log, (int8_t)data, name, unit);
        break;
    }
    case 2:
    {
        return dlt_user_log_write_int16_attr(log, (int16_t)data, name, unit);
        break;
    }
    case 4:
    {
        return dlt_user_log_write_int32_attr(log, (int32_t)data, name, unit);
        break;
    }
    case 8:
    {
        return dlt_user_log_write_int64_attr(log, (int64_t)data, name, unit);
        break;
    }
    default:
    {
        return DLT_RETURN_ERROR;
        break;
    }
    }

    return DLT_RETURN_OK;
}

DltReturnValue dlt_user_log_write_int8(DltContextData *log, int8_t data)
{
    uint32_t type_info = DLT_TYPE_INFO_SINT | DLT_TYLE_8BIT;
    return dlt_user_log_write_generic_attr(log, &data, sizeof(int8_t), type_info, NULL);
}

DltReturnValue dlt_user_log_write_int16(DltContextData *log, int16_t data)
{
    uint32_t type_info = DLT_TYPE_INFO_SINT | DLT_TYLE_16BIT;
    return dlt_user_log_write_generic_attr(log, &data, sizeof(int16_t), type_info, NULL);
}

DltReturnValue dlt_user_log_write_int32(DltContextData *log, int32_t data)
{
    uint32_t type_info = DLT_TYPE_INFO_SINT | DLT_TYLE_32BIT;
    return dlt_user_log_write_generic_attr(log, &data, sizeof(int32_t), type_info, NULL);
}

DltReturnValue dlt_user_log_write_int64(DltContextData *log, int64_t data)
{
    uint32_t type_info = DLT_TYPE_INFO_SINT | DLT_TYLE_64BIT;
    return dlt_user_log_write_generic_attr(log, &data, sizeof(int64_t), type_info, NULL);
}

DltReturnValue dlt_user_log_write_int(DltContextData *log, int data)
{
    return dlt_user_log_write_int_attr(log, data, NULL, NULL);
}

DltReturnValue dlt_user_log_write_int8_attr(DltContextData *log, int8_t data, const char *name, const char *unit)
{
    uint32_t type_info = DLT_TYPE_INFO_SINT | DLT_TYLE_8BIT;
    const VarInfo var_info = { name, unit, true };
    return dlt_user_log_write_generic_attr(log, &data, sizeof(int8_t), type_info, &var_info);
}

DltReturnValue dlt_user_log_write_int16_attr(DltContextData *log, int16_t data, const char *name, const char *unit)
{
    uint32_t type_info = DLT_TYPE_INFO_SINT | DLT_TYLE_16BIT;
    const VarInfo var_info = { name, unit, true };
    return dlt_user_log_write_generic_attr(log, &data, sizeof(int16_t), type_info, &var_info);
}

DltReturnValue dlt_user_log_write_int32_attr(DltContextData *log, int32_t data, const char *name, const char *unit)
{
    uint32_t type_info = DLT_TYPE_INFO_SINT | DLT_TYLE_32BIT;
    const VarInfo var_info = { name, unit, true };
    return dlt_user_log_write_generic_attr(log, &data, sizeof(int32_t), type_info, &var_info);
}

DltReturnValue dlt_user_log_write_int64_attr(DltContextData *log, int64_t data, const char *name, const char *unit)
{
    uint32_t type_info = DLT_TYPE_INFO_SINT | DLT_TYLE_64BIT;
    const VarInfo var_info = { name, unit, true };
    return dlt_user_log_write_generic_attr(log, &data, sizeof(int64_t), type_info, &var_info);
}

DltReturnValue dlt_user_log_write_bool(DltContextData *log, uint8_t data)
{
    uint32_t type_info = DLT_TYPE_INFO_BOOL | DLT_TYLE_8BIT;
    return dlt_user_log_write_generic_attr(log, &data, sizeof(uint8_t), type_info, NULL);
}

DltReturnValue dlt_user_log_write_bool_attr(DltContextData *log, uint8_t data, const char *name)
{
    uint32_t type_info = DLT_TYPE_INFO_BOOL | DLT_TYLE_8BIT;
    const VarInfo var_info = { name, NULL, false };
    return dlt_user_log_write_generic_attr(log, &data, sizeof(uint8_t), type_info, &var_info);
}

DltReturnValue dlt_user_log_write_string(DltContextData *log, const char *text)
{
    return dlt_user_log_write_string_utils_attr(log, text, ASCII_STRING, NULL, false);
}

DltReturnValue dlt_user_log_write_string_attr(DltContextData *log, const char *text, const char *name)
{
    return dlt_user_log_write_string_utils_attr(log, text, ASCII_STRING, name, true);
}

DltReturnValue dlt_user_log_write_sized_string(DltContextData *log, const char *text, uint16_t length)
{
    return dlt_user_log_write_sized_string_utils_attr(log, text, length, ASCII_STRING, NULL, false);
}

DltReturnValue dlt_user_log_write_sized_string_attr(DltContextData *log, const char *text, uint16_t length, const char *name)
{
    return dlt_user_log_write_sized_string_utils_attr(log, text, length, ASCII_STRING, name, true);
}

DltReturnValue dlt_user_log_write_constant_string(DltContextData *log, const char *text)
{
    /* Send parameter only in verbose mode */
    return is_verbose_mode(dlt_user.verbose_mode, log) ? dlt_user_log_write_string(log, text) : DLT_RETURN_OK;
}

DltReturnValue dlt_user_log_write_constant_string_attr(DltContextData *log, const char *text, const char *name)
{
    /* Send parameter only in verbose mode */
    return is_verbose_mode(dlt_user.verbose_mode, log) ? dlt_user_log_write_string_attr(log, text, name) : DLT_RETURN_OK;
}

DltReturnValue dlt_user_log_write_sized_constant_string(DltContextData *log, const char *text, uint16_t length)
{
    /* Send parameter only in verbose mode */
    return is_verbose_mode(dlt_user.verbose_mode, log) ? dlt_user_log_write_sized_string(log, text, length) : DLT_RETURN_OK;
}

DltReturnValue dlt_user_log_write_sized_constant_string_attr(DltContextData *log, const char *text, uint16_t length, const char *name)
{
    /* Send parameter only in verbose mode */
    return is_verbose_mode(dlt_user.verbose_mode, log) ? dlt_user_log_write_sized_string_attr(log, text, length, name) : DLT_RETURN_OK;
}

DltReturnValue dlt_user_log_write_utf8_string(DltContextData *log, const char *text)
{
    return dlt_user_log_write_string_utils_attr(log, text, UTF8_STRING, NULL, false);
}

DltReturnValue dlt_user_log_write_utf8_string_attr(DltContextData *log, const char *text, const char *name)
{
    return dlt_user_log_write_string_utils_attr(log, text, UTF8_STRING, name, true);
}

DltReturnValue dlt_user_log_write_sized_utf8_string(DltContextData *log, const char *text, uint16_t length)
{
    return dlt_user_log_write_sized_string_utils_attr(log, text, length, UTF8_STRING, NULL, false);
}

DltReturnValue dlt_user_log_write_sized_utf8_string_attr(DltContextData *log, const char *text, uint16_t length, const char *name)
{
    return dlt_user_log_write_sized_string_utils_attr(log, text, length, UTF8_STRING, name, true);
}

DltReturnValue dlt_user_log_write_constant_utf8_string(DltContextData *log, const char *text)
{
    /* Send parameter only in verbose mode */
    return is_verbose_mode(dlt_user.verbose_mode, log) ? dlt_user_log_write_utf8_string(log, text) : DLT_RETURN_OK;
}

DltReturnValue dlt_user_log_write_constant_utf8_string_attr(DltContextData *log, const char *text, const char *name)
{
    /* Send parameter only in verbose mode */
    return is_verbose_mode(dlt_user.verbose_mode, log) ? dlt_user_log_write_utf8_string_attr(log, text, name) : DLT_RETURN_OK;
}

DltReturnValue dlt_user_log_write_sized_constant_utf8_string(DltContextData *log, const char *text, uint16_t length)
{
    /* Send parameter only in verbose mode */
    return is_verbose_mode(dlt_user.verbose_mode, log) ? dlt_user_log_write_sized_utf8_string(log, text, length) : DLT_RETURN_OK;
}

DltReturnValue dlt_user_log_write_sized_constant_utf8_string_attr(DltContextData *log, const char *text, uint16_t length, const char *name)
{
    /* Send parameter only in verbose mode */
    return is_verbose_mode(dlt_user.verbose_mode, log) ? dlt_user_log_write_sized_utf8_string_attr(log, text, length, name) : DLT_RETURN_OK;
}

static DltReturnValue dlt_user_log_write_sized_string_utils_attr(DltContextData *log, const char *text, uint16_t length, const enum StringType type, const char *name, bool with_var_info)
{
    if ((log == NULL) || (text == NULL))
        return DLT_RETURN_WRONG_PARAMETER;

    if (!dlt_user_initialised) {
        dlt_vlog(LOG_WARNING, "%s dlt_user_initialised false\n", __FUNCTION__);
        return DLT_RETURN_ERROR;
    }

    const uint16_t name_size = (name != NULL) ? strlen(name)+1 : 0;

    uint16_t arg_size = (uint16_t) (length + 1);

    size_t new_log_size = log->size + arg_size + sizeof(uint16_t);

    uint32_t type_info = 0;

    if (is_verbose_mode(dlt_user.verbose_mode, log)) {
        new_log_size += sizeof(uint32_t);
        if (with_var_info) {
            new_log_size += sizeof(uint16_t);  // length of "name" attribute
            new_log_size += name_size;  // the "name" attribute itself

            type_info |= DLT_TYPE_INFO_VARI;
        }
    }

    size_t str_truncate_message_length = strlen(STR_TRUNCATED_MESSAGE) + 1;
    size_t max_payload_str_msg;
    DltReturnValue ret = DLT_RETURN_OK;

    /* Check log size condition */
    if (new_log_size > dlt_user.log_buf_len) {
        ret = DLT_RETURN_USER_BUFFER_FULL;

        /* Re-calculate arg_size */
        arg_size = (uint16_t) (dlt_user.log_buf_len - log->size - sizeof(uint16_t));

        size_t min_payload_str_truncate_msg = log->size + str_truncate_message_length + sizeof(uint16_t);

        if (is_verbose_mode(dlt_user.verbose_mode, log)) {
            min_payload_str_truncate_msg += sizeof(uint32_t);
            arg_size -= (uint16_t) sizeof(uint32_t);
            if (with_var_info) {
                min_payload_str_truncate_msg += sizeof(uint16_t) + name_size;
                arg_size -= sizeof(uint16_t) + name_size;
            }
        }

        /* Return when dlt_user.log_buf_len does not have enough space for min_payload_str_truncate_msg */
        if (min_payload_str_truncate_msg > dlt_user.log_buf_len) {
            dlt_vlog(LOG_WARNING, "%s not enough minimum space to store data\n", __FUNCTION__);
            return ret;
        }

        /* Calculate the maximum size of string will be copied after truncate */
        max_payload_str_msg = dlt_user.log_buf_len - min_payload_str_truncate_msg;

        if (type == UTF8_STRING) {
            /**
             * Adjust the lengh to truncate one utf8 character corectly
             * refer: https://en.wikipedia.org/wiki/UTF-8
             * one utf8 character will have maximum 4 bytes then maximum bytes will be truncate additional is 3
             */
            const char *tmp = (text + max_payload_str_msg - 3);
            uint16_t reduce_size = 0;

            if (tmp[2] & 0x80) {
                /* Is the last byte of truncated text is the first byte in multi-byte sequence (utf8 2 bytes) */
                if (tmp[2] & 0x40)
                    reduce_size = 1;
                /* Is the next to last byte of truncated text is the first byte in multi-byte sequence (utf8 3 bytes) */
                else if ((tmp[1] & 0xe0) == 0xe0)
                    reduce_size = 2;
                /* utf8 4 bytes */
                else if ((tmp[0] & 0xf0) == 0xf0)
                    reduce_size = 3;
            }

            max_payload_str_msg -= reduce_size;
            arg_size -= (uint16_t) reduce_size;
        }
    }

    if (is_verbose_mode(dlt_user.verbose_mode, log)) {
        switch (type) {
        case ASCII_STRING:
            type_info |= DLT_TYPE_INFO_STRG | DLT_SCOD_ASCII;
            break;
        case UTF8_STRING:
            type_info |= DLT_TYPE_INFO_STRG | DLT_SCOD_UTF8;
            break;
        default:
            /* Do nothing */
            break;
        }

        memcpy(log->buffer + log->size, &type_info, sizeof(uint32_t));
        log->size += sizeof(uint32_t);
    }

    memcpy(log->buffer + log->size, &arg_size, sizeof(uint16_t));
    log->size += sizeof(uint16_t);

    if (is_verbose_mode(dlt_user.verbose_mode, log)) {
        if (with_var_info) {
            // Write length of "name" attribute.
            // We assume that the protocol allows zero-sized strings here (which this code will create
            // when the input pointer is NULL).
            memcpy(log->buffer + log->size, &name_size, sizeof(uint16_t));
            log->size += sizeof(uint16_t);

            // Write name string itself.
            // Must not use NULL as source pointer for memcpy. This check assures that.
            if (name_size != 0) {
                memcpy(log->buffer + log->size, name, name_size);
                log->size += name_size;
            }
        }
    }

    switch (ret) {
    case DLT_RETURN_OK:
    {
        /* Whole string will be copied */
        memcpy(log->buffer + log->size, text, length);
        /* The input string might not be null-terminated, so we're doing that by ourselves */
        log->buffer[log->size + length] = '\0';
        log->size += arg_size;
        break;
    }
    case DLT_RETURN_USER_BUFFER_FULL:
    {
        /* Only copy partial string */
        memcpy(log->buffer + log->size, text, max_payload_str_msg);
        log->size += max_payload_str_msg;

        /* Append string truncate the input string */
        memcpy(log->buffer + log->size, STR_TRUNCATED_MESSAGE, str_truncate_message_length);
        log->size += str_truncate_message_length;
        break;
    }
    default:
    {
        /* Do nothing */
        break;
    }
    }

    log->args_num++;

    return ret;
}

static DltReturnValue dlt_user_log_write_string_utils_attr(DltContextData *log, const char *text, const enum StringType type, const char *name, bool with_var_info)
{
    if ((log == NULL) || (text == NULL))
        return DLT_RETURN_WRONG_PARAMETER;

    uint16_t length = (uint16_t) strlen(text);
    return dlt_user_log_write_sized_string_utils_attr(log, text, length, type, name, with_var_info);
}

DltReturnValue dlt_register_injection_callback_with_id(DltContext *handle, uint32_t service_id,
                                                       dlt_injection_callback_id dlt_injection_cbk, void *priv)
{
    DltContextData log;
    uint32_t i, j, k;
    int found = 0;

    DltUserInjectionCallback *old;

    if (dlt_user_log_init(handle, &log) < DLT_RETURN_OK)
        return DLT_RETURN_ERROR;

    if (service_id < DLT_USER_INJECTION_MIN)
        return DLT_RETURN_WRONG_PARAMETER;

    /* This function doesn't make sense storing to local file is choosen;
     * so terminate this function */
    if (dlt_user.dlt_is_file)
        return DLT_RETURN_OK;

    DLT_SEM_LOCK();

    if (dlt_user.dlt_ll_ts == NULL) {
        DLT_SEM_FREE();
        return DLT_RETURN_OK;
    }

    /* Insert callback in corresponding table */
    i = (uint32_t) handle->log_level_pos;

    /* Insert each service_id only once */
    for (k = 0; k < dlt_user.dlt_ll_ts[i].nrcallbacks; k++)
        if ((dlt_user.dlt_ll_ts[i].injection_table) &&
            (dlt_user.dlt_ll_ts[i].injection_table[k].service_id == service_id)) {
            found = 1;
            break;
        }

    if (found) {
        j = k;
    }
    else {
        j = dlt_user.dlt_ll_ts[i].nrcallbacks;

        /* Allocate or expand injection table */
        if (dlt_user.dlt_ll_ts[i].injection_table == NULL) {
            dlt_user.dlt_ll_ts[i].injection_table =
                (DltUserInjectionCallback *)malloc(sizeof(DltUserInjectionCallback));

            if (dlt_user.dlt_ll_ts[i].injection_table == NULL) {
                DLT_SEM_FREE();
                return DLT_RETURN_ERROR;
            }
        }
        else {
            old = dlt_user.dlt_ll_ts[i].injection_table;
            dlt_user.dlt_ll_ts[i].injection_table = (DltUserInjectionCallback *)malloc(
                sizeof(DltUserInjectionCallback) * (j + 1));

            if (dlt_user.dlt_ll_ts[i].injection_table == NULL) {
                dlt_user.dlt_ll_ts[i].injection_table = old;
                DLT_SEM_FREE();
                return DLT_RETURN_ERROR;
            }

            memcpy(dlt_user.dlt_ll_ts[i].injection_table, old, sizeof(DltUserInjectionCallback) * j);
            free(old);
        }

        dlt_user.dlt_ll_ts[i].nrcallbacks++;
    }

    /* Store service_id and corresponding function pointer for callback function */
    dlt_user.dlt_ll_ts[i].injection_table[j].service_id = service_id;

    if (priv == NULL) {
        dlt_user.dlt_ll_ts[i].injection_table[j].injection_callback = (dlt_injection_callback)(void*)dlt_injection_cbk;
        dlt_user.dlt_ll_ts[i].injection_table[j].injection_callback_with_id = NULL;
        dlt_user.dlt_ll_ts[i].injection_table[j].data = NULL;
    }
    else {
        dlt_user.dlt_ll_ts[i].injection_table[j].injection_callback = NULL;
        dlt_user.dlt_ll_ts[i].injection_table[j].injection_callback_with_id = dlt_injection_cbk;
        dlt_user.dlt_ll_ts[i].injection_table[j].data = priv;
    }

    DLT_SEM_FREE();

    return DLT_RETURN_OK;
}

DltReturnValue dlt_register_injection_callback(DltContext *handle, uint32_t service_id,
                                               int (*dlt_injection_callback)(uint32_t service_id,
                                                                             void *data,
                                                                             uint32_t length))
{
    return dlt_register_injection_callback_with_id(handle,
                                                   service_id,
                                                   (dlt_injection_callback_id)(void*)dlt_injection_callback,
                                                   NULL);
}

DltReturnValue dlt_register_log_level_changed_callback(DltContext *handle,
                                                       void (*dlt_log_level_changed_callback)(
                                                           char context_id[DLT_ID_SIZE],
                                                           uint8_t log_level,
                                                           uint8_t trace_status))
{
    DltContextData log;
    uint32_t i;

    if (dlt_user_log_init(handle, &log) < DLT_RETURN_OK)
        return DLT_RETURN_ERROR;

    /* This function doesn't make sense storing to local file is choosen;
     * so terminate this function */
    if (dlt_user.dlt_is_file)
        return DLT_RETURN_OK;

    DLT_SEM_LOCK();

    if (dlt_user.dlt_ll_ts == NULL) {
        DLT_SEM_FREE();
        return DLT_RETURN_OK;
    }

    /* Insert callback in corresponding table */
    i = (uint32_t) handle->log_level_pos;

    /* Store new callback function */
    dlt_user.dlt_ll_ts[i].log_level_changed_callback = dlt_log_level_changed_callback;

    DLT_SEM_FREE();

    return DLT_RETURN_OK;
}

/**
 * NW Trace related
 */

#ifdef DLT_NETWORK_TRACE_ENABLE
int check_buffer(void)
{
    int total_size, used_size;
    dlt_user_check_buffer(&total_size, &used_size);

    return (total_size - used_size < total_size / 2) ? -1 : 1;
}

/**
 * Send the start of a segment chain.
 * Returns DLT_RETURN_ERROR on failure
 */
DltReturnValue dlt_user_trace_network_segmented_start(uint32_t *id,
                                                      DltContext *handle,
                                                      DltNetworkTraceType nw_trace_type,
                                                      uint16_t header_len,
                                                      void *header,
                                                      uint16_t payload_len)
{
    DltContextData log = { 0 };
    struct timeval tv;
    int ret = DLT_RETURN_ERROR;

    /* check null pointer */
    if (id == NULL)
        return DLT_RETURN_WRONG_PARAMETER;

    if ((nw_trace_type < DLT_NW_TRACE_IPC) || (nw_trace_type >= DLT_NW_TRACE_MAX)) {
        dlt_vlog(LOG_ERR, "Network trace type %u is outside valid range", nw_trace_type);
        return DLT_RETURN_WRONG_PARAMETER;
    }

    if (dlt_user.dlt_ll_ts == NULL)
        return DLT_RETURN_ERROR;

    if (handle->trace_status_ptr && (*(handle->trace_status_ptr) == DLT_TRACE_STATUS_ON)) {
        /* initialize values */
        if (dlt_user_log_init(handle, &log) < DLT_RETURN_OK)
            return DLT_RETURN_ERROR;

        if (log.buffer == NULL) {
            log.buffer = calloc(sizeof(unsigned char), dlt_user.log_buf_len);

            if (log.buffer == NULL) {
                dlt_vlog(LOG_ERR, "Cannot allocate buffer for DLT Log message\n");
                return DLT_RETURN_ERROR;
            }
        }

        log.args_num = 0;
        log.trace_status = nw_trace_type;
        log.size = 0;

        gettimeofday(&tv, NULL);
        *id = (uint32_t) tv.tv_usec;

        /* Write identifier */
        if (dlt_user_log_write_string(&log, DLT_TRACE_NW_START) < 0) {
            dlt_user_free_buffer(&(log.buffer));
            return DLT_RETURN_ERROR;
        }

        /* Write stream handle */
        if (dlt_user_log_write_uint32(&log, *id) < 0) {
            dlt_user_free_buffer(&(log.buffer));
            return DLT_RETURN_ERROR;
        }

        /* Write header */
        if (dlt_user_log_write_raw(&log, header, header_len) < 0) {
            dlt_user_free_buffer(&(log.buffer));
            return DLT_RETURN_ERROR;
        }

        /* Write size of payload */
        if (dlt_user_log_write_uint32(&log, payload_len) < 0) {
            dlt_user_free_buffer(&(log.buffer));
            return DLT_RETURN_ERROR;
        }

        /* Write expected segment count */
        uint16_t segment_count = (uint16_t) (payload_len / DLT_MAX_TRACE_SEGMENT_SIZE + 1);

        /* If segments align perfectly with segment size, avoid sending empty segment */
        if ((payload_len % DLT_MAX_TRACE_SEGMENT_SIZE) == 0)
            segment_count--;

        if (dlt_user_log_write_uint16(&log, segment_count) < 0) {
            dlt_user_free_buffer(&(log.buffer));
            return DLT_RETURN_ERROR;
        }

        /* Write length of one segment */
        if (dlt_user_log_write_uint16(&log, DLT_MAX_TRACE_SEGMENT_SIZE) < 0) {
            dlt_user_free_buffer(&(log.buffer));
            return DLT_RETURN_ERROR;
        }

        /* Send log */
        ret = dlt_user_log_send_log(&log, DLT_TYPE_NW_TRACE);

        dlt_user_free_buffer(&(log.buffer));

        return ret;
    }

    return DLT_RETURN_OK;
}

DltReturnValue dlt_user_trace_network_segmented_segment(uint32_t id,
                                                        DltContext *handle,
                                                        DltNetworkTraceType nw_trace_type,
                                                        int sequence,
                                                        uint16_t payload_len,
                                                        void *payload)
{
    int ret = DLT_RETURN_ERROR;
    struct timespec ts;

    if ((nw_trace_type < DLT_NW_TRACE_IPC) || (nw_trace_type >= DLT_NW_TRACE_MAX)) {
        dlt_vlog(LOG_ERR, "Network trace type %u is outside valid range", nw_trace_type);
        return DLT_RETURN_WRONG_PARAMETER;
    }

    while (check_buffer() < 0) {
        /* Wait 50ms */
        ts.tv_sec = 0;
        ts.tv_nsec = 1000000 * 50;
        nanosleep(&ts, NULL);
        dlt_user_log_resend_buffer();
    }

    if (dlt_user.dlt_ll_ts == NULL)
        return DLT_RETURN_ERROR;

    if (handle->trace_status_ptr && (*(handle->trace_status_ptr) == DLT_TRACE_STATUS_ON)) {
        DltContextData log = { 0 };

        if (dlt_user_log_init(handle, &log) < DLT_RETURN_OK)
            return DLT_RETURN_ERROR;

        /* initialize values */
        if (log.buffer == NULL) {
            log.buffer = calloc(sizeof(unsigned char), dlt_user.log_buf_len);

            if (log.buffer == NULL) {
                dlt_vlog(LOG_ERR, "Cannot allocate buffer for DLT Log message\n");
                return DLT_RETURN_ERROR;
            }
        }

        log.args_num = 0;
        log.trace_status = nw_trace_type;
        log.size = 0;

        /* Write identifier */
        if (dlt_user_log_write_string(&log, DLT_TRACE_NW_SEGMENT) < DLT_RETURN_OK) {
            dlt_user_free_buffer(&(log.buffer));
            return DLT_RETURN_ERROR;
        }

        /* Write stream handle */
        if (dlt_user_log_write_uint32(&log, id) < DLT_RETURN_OK) {
            dlt_user_free_buffer(&(log.buffer));
            return DLT_RETURN_ERROR;
        }

        /* Write segment sequence number */
        if (dlt_user_log_write_uint16(&log, (uint16_t) sequence) < DLT_RETURN_OK) {
            dlt_user_free_buffer(&(log.buffer));
            return DLT_RETURN_ERROR;
        }

        /* Write data */
        if (dlt_user_log_write_raw(&log, payload, payload_len) < DLT_RETURN_OK) {
            dlt_user_free_buffer(&(log.buffer));
            return DLT_RETURN_ERROR;
        }

        ret = dlt_user_log_send_log(&log, DLT_TYPE_NW_TRACE);
        /* Send log */

        dlt_user_free_buffer(&(log.buffer));

        return ret;
    }

    /* Allow other threads to log between chunks */
    sched_yield();
    return DLT_RETURN_OK;
}

DltReturnValue dlt_user_trace_network_segmented_end(uint32_t id, DltContext *handle, DltNetworkTraceType nw_trace_type)
{
    DltContextData log = { 0 };
    int ret = DLT_RETURN_ERROR;

    if ((nw_trace_type < DLT_NW_TRACE_IPC) || (nw_trace_type >= DLT_NW_TRACE_MAX)) {
        dlt_vlog(LOG_ERR, "Network trace type %u is outside valid range", nw_trace_type);
        return DLT_RETURN_WRONG_PARAMETER;
    }

    if (dlt_user.dlt_ll_ts == NULL)
        return DLT_RETURN_ERROR;

    if (handle->trace_status_ptr && (*(handle->trace_status_ptr) == DLT_TRACE_STATUS_ON)) {
        /* initialize values */
        if (dlt_user_log_init(handle, &log) < DLT_RETURN_OK)
            return DLT_RETURN_ERROR;

        /* initialize values */
        if (log.buffer == NULL) {
            log.buffer = calloc(sizeof(unsigned char), dlt_user.log_buf_len);

            if (log.buffer == NULL) {
                dlt_vlog(LOG_ERR, "Cannot allocate buffer for DLT Log message\n");
                return DLT_RETURN_ERROR;
            }
        }

        log.args_num = 0;
        log.trace_status = nw_trace_type;
        log.size = 0;

        /* Write identifier */
        if (dlt_user_log_write_string(&log, DLT_TRACE_NW_END) < DLT_RETURN_OK) {
            dlt_user_free_buffer(&(log.buffer));
            return DLT_RETURN_ERROR;
        }

        /* Write stream handle */
        if (dlt_user_log_write_uint32(&log, id) < DLT_RETURN_OK) {
            dlt_user_free_buffer(&(log.buffer));
            return DLT_RETURN_ERROR;
        }

        ret = dlt_user_log_send_log(&log, DLT_TYPE_NW_TRACE);
        /* Send log */

        dlt_user_free_buffer(&(log.buffer));

        return ret;

    }

    return DLT_RETURN_OK;
}

void dlt_user_trace_network_segmented_thread(void *unused)
{
    /* Unused on purpose. */
    (void)unused;
#ifdef DLT_USE_PTHREAD_SETNAME_NP
    if (pthread_setname_np(dlt_user.dlt_segmented_nwt_handle, "dlt_segmented"))
        dlt_log(LOG_WARNING, "Failed to rename segmented thread!\n");
#elif linux
    if (prctl(PR_SET_NAME, "dlt_segmented", 0, 0, 0) < 0)
        dlt_log(LOG_WARNING, "Failed to rename segmented thread!\n");
#endif
    pthread_cleanup_push(dlt_user_cleanup_handler, NULL);

    s_segmented_data *data;

    while (1) {
        /* Wait until message queue is initialized */
        dlt_lock_mutex(&mq_mutex);

        while (dlt_user.dlt_segmented_queue_read_handle < 0)
        {
            pthread_cond_wait(&mq_init_condition, &mq_mutex);
        }

        dlt_unlock_mutex(&mq_mutex);

        ssize_t read = mq_receive(dlt_user.dlt_segmented_queue_read_handle, (char *)&data,
                                  sizeof(s_segmented_data *), NULL);

        if (read < 0) {
            if (errno != EINTR) {
                struct timespec req;
                long sec = (DLT_USER_MQ_ERROR_RETRY_INTERVAL / 1000000);
                dlt_vlog(LOG_WARNING, "NWTSegmented: Error while reading queue: %s\n", strerror(errno));
                req.tv_sec = sec;
                req.tv_nsec = (DLT_USER_MQ_ERROR_RETRY_INTERVAL - sec * 1000000) * 1000;
                nanosleep(&req, NULL);
            }

            continue;
        }

        if (read != sizeof(s_segmented_data *)) {
            /* This case will not happen. */
            /* When this thread is interrupted by signal, mq_receive() will not return */
            /* partial read length and will return -1. And also no data is removed from mq. */
            dlt_vlog(LOG_WARNING, "NWTSegmented: Could not read data fully from queue: %zd\n", read);
            continue;
        }

        dlt_user_trace_network_segmented_thread_segmenter(data);

        /* Send the end message */
        DltReturnValue err = dlt_user_trace_network_segmented_end(data->id, data->handle, data->nw_trace_type);

        if ((err == DLT_RETURN_BUFFER_FULL) || (err == DLT_RETURN_ERROR))
            dlt_log(LOG_WARNING, "NWTSegmented: Could not send end segment.\n");

        /* Free resources */
        free(data->header);
        free(data->payload);
        free(data);
    }

    pthread_cleanup_pop(1);
}

void dlt_user_trace_network_segmented_thread_segmenter(s_segmented_data *data)
{
    /* Segment the data and send the chunks */
    void *ptr = NULL;
    uint32_t offset = 0;
    uint16_t sequence = 0;

    do {
        uint16_t len = 0;

        if (offset + DLT_MAX_TRACE_SEGMENT_SIZE > data->payload_len)
            len = (uint16_t) (data->payload_len - offset);
        else
            len = DLT_MAX_TRACE_SEGMENT_SIZE;

        /* If payload size aligns perfectly with segment size, avoid sending empty segment */
        if (len == 0)
            break;

        ptr = data->payload + offset;
        DltReturnValue err = dlt_user_trace_network_segmented_segment(data->id,
                                                                      data->handle,
                                                                      data->nw_trace_type,
                                                                      sequence++,
                                                                      len,
                                                                      ptr);

        if ((err == DLT_RETURN_BUFFER_FULL) || (err == DLT_RETURN_ERROR)) {
            dlt_log(LOG_ERR, "NWTSegmented: Could not send segment. Aborting.\n");
            break;             /* loop */
        }

        offset += len;
    } while (ptr < data->payload + data->payload_len);
}


DltReturnValue dlt_user_trace_network_segmented(DltContext *handle,
                                                DltNetworkTraceType nw_trace_type,
                                                uint16_t header_len,
                                                void *header,
                                                uint16_t payload_len,
                                                void *payload)
{
    /* forbid dlt usage in child after fork */
    if (g_dlt_is_child)
        return DLT_RETURN_ERROR;

    /* Send as normal trace if possible */
    if (header_len + payload_len + (uint16_t) sizeof(uint16_t) < dlt_user.log_buf_len)
        return dlt_user_trace_network(handle, nw_trace_type, header_len, header, payload_len, payload);

    /* Allocate Memory */
    s_segmented_data *thread_data = malloc(sizeof(s_segmented_data));

    if (thread_data == NULL)
        return DLT_RETURN_ERROR;

    thread_data->header = malloc(header_len);

    if (thread_data->header == NULL) {
        free(thread_data);
        return DLT_RETURN_ERROR;
    }

    thread_data->payload = malloc(payload_len);

    if (thread_data->payload == NULL) {
        free(thread_data->header);
        free(thread_data);
        return DLT_RETURN_ERROR;
    }

    /* Copy data */
    thread_data->handle = handle;
    thread_data->nw_trace_type = nw_trace_type;
    thread_data->header_len = header_len;
    memcpy(thread_data->header, header, header_len);
    thread_data->payload_len = payload_len;
    memcpy(thread_data->payload, payload, payload_len);

    /* Send start message */
    DltReturnValue err = dlt_user_trace_network_segmented_start(&(thread_data->id),
                                                                thread_data->handle,
                                                                thread_data->nw_trace_type,
                                                                (uint16_t) thread_data->header_len,
                                                                thread_data->header,
                                                                (uint16_t) thread_data->payload_len);

    if ((err == DLT_RETURN_BUFFER_FULL) || (err == DLT_RETURN_ERROR)) {
        dlt_log(LOG_ERR, "NWTSegmented: Could not send start segment. Aborting.\n");
        free(thread_data->header);
        free(thread_data->payload);
        free(thread_data);
        return DLT_RETURN_ERROR;
    }

    /* Open queue if it is not open */
    if (dlt_init_message_queue() < 0) {
        dlt_log(LOG_ERR, "NWTSegmented: Could not open queue.\n");
        free(thread_data->header);
        free(thread_data->payload);
        free(thread_data);

        return DLT_RETURN_ERROR;
    }

    /* Add to queue */
    if (mq_send(dlt_user.dlt_segmented_queue_write_handle,
                (char *)&thread_data, sizeof(s_segmented_data *), 1) < 0) {
        if (errno == EAGAIN)
            dlt_log(LOG_WARNING, "NWTSegmented: Queue full. Message discarded.\n");

        free(thread_data->header);
        free(thread_data->payload);
        free(thread_data);
        dlt_vnlog(LOG_WARNING, 256, "NWTSegmented: Could not write into queue: %s \n", strerror(errno));
        return DLT_RETURN_ERROR;
    }

    /*thread_data will be freed by the receiver function */
    /*coverity[leaked_storage] */
    return DLT_RETURN_OK;
}

DltReturnValue dlt_user_trace_network(DltContext *handle,
                                      DltNetworkTraceType nw_trace_type,
                                      uint16_t header_len,
                                      void *header,
                                      uint16_t payload_len,
                                      void *payload)
{
    return dlt_user_trace_network_truncated(handle, nw_trace_type, header_len, header, payload_len, payload, 1);
}

DltReturnValue dlt_user_trace_network_truncated(DltContext *handle,
                                                DltNetworkTraceType nw_trace_type,
                                                uint16_t header_len,
                                                void *header,
                                                uint16_t payload_len,
                                                void *payload,
                                                int allow_truncate)
{
    int ret = DLT_RETURN_ERROR;
    DltContextData log = { 0 };

    if ((payload == NULL) && (payload_len > 0))
        return DLT_RETURN_WRONG_PARAMETER;

    if ((nw_trace_type < DLT_NW_TRACE_IPC) || (nw_trace_type >= DLT_NW_TRACE_MAX)) {
        dlt_vlog(LOG_ERR, "Network trace type %u is outside valid range", nw_trace_type);
        return DLT_RETURN_WRONG_PARAMETER;
    }

    if (dlt_user.dlt_ll_ts == NULL)
        return DLT_RETURN_ERROR;

    if (handle->trace_status_ptr && (*(handle->trace_status_ptr) == DLT_TRACE_STATUS_ON)) {
        if ((dlt_user_log_init(handle, &log) < DLT_RETURN_OK) || (dlt_user.dlt_ll_ts == NULL))
            return DLT_RETURN_ERROR;

        /* initialize values */
        if (log.buffer == NULL) {
            log.buffer = calloc(sizeof(unsigned char), dlt_user.log_buf_len);

            if (log.buffer == NULL) {
                dlt_vlog(LOG_ERR, "Cannot allocate buffer for DLT Log message\n");
                return DLT_RETURN_ERROR;
            }
        }

        log.args_num = 0;
        log.trace_status = nw_trace_type;
        log.size = 0;

        if (header == NULL)
            header_len = 0;

        /* If truncation is allowed, check if we must do it */
        if ((allow_truncate > 0) && ((header_len + payload_len + (uint16_t) sizeof(uint16_t)) > dlt_user.log_buf_len)) {
            /* Identify as truncated */
            if (dlt_user_log_write_string(&log, DLT_TRACE_NW_TRUNCATED) < DLT_RETURN_OK) {
                dlt_user_free_buffer(&(log.buffer));
                return DLT_RETURN_ERROR;
            }

            /* Write header and its length */
            if (dlt_user_log_write_raw(&log, header, header_len) < DLT_RETURN_OK) {
                dlt_user_free_buffer(&(log.buffer));
                return DLT_RETURN_ERROR;
            }

            /* Write original size of payload */
            if (dlt_user_log_write_uint32(&log, payload_len) < DLT_RETURN_OK) {
                dlt_user_free_buffer(&(log.buffer));
                return DLT_RETURN_ERROR;
            }

            /**
             *  Calculate maximum available space in sending buffer after headers.
             */

            uint16_t truncated_payload_len = (uint16_t) (dlt_user.log_buf_len - log.size - sizeof(uint16_t) - sizeof(uint32_t));

            /* Write truncated payload */
            if (dlt_user_log_write_raw(&log, payload, truncated_payload_len) < DLT_RETURN_OK) {
                dlt_user_free_buffer(&(log.buffer));
                return DLT_RETURN_ERROR;
            }
        }
        else { /* Truncation not allowed or data short enough */

            /* Write header and its length */
            if (dlt_user_log_write_raw(&log, header, header_len) < DLT_RETURN_OK) {
                dlt_user_free_buffer(&(log.buffer));
                return DLT_RETURN_ERROR;
            }

            if (payload == NULL)
                payload_len = 0;

            /* Write payload and its length */
            if (dlt_user_log_write_raw(&log, payload, payload_len) < DLT_RETURN_OK) {
                dlt_user_free_buffer(&(log.buffer));
                return DLT_RETURN_ERROR;
            }
        }

        ret = dlt_user_log_send_log(&log, DLT_TYPE_NW_TRACE);

        dlt_user_free_buffer(&(log.buffer));

        /* Send log */
        return ret;
    }

    return DLT_RETURN_OK;
}
#endif /* DLT_NETWORK_TRACE_ENABLE */

DltReturnValue dlt_log_string(DltContext *handle, DltLogLevelType loglevel, const char *text)
{
    if (!is_verbose_mode(dlt_user.verbose_mode, NULL))
        return DLT_RETURN_ERROR;

    if ((handle == NULL) || (text == NULL))
        return DLT_RETURN_WRONG_PARAMETER;

    DltReturnValue ret = DLT_RETURN_OK;
    DltContextData log;

    if (dlt_user_log_write_start(handle, &log, loglevel) == DLT_RETURN_TRUE) {
        ret = dlt_user_log_write_string(&log, text);

        if (dlt_user_log_write_finish(&log) < DLT_RETURN_OK)
            ret = DLT_RETURN_ERROR;
    }

    return ret;
}

DltReturnValue dlt_log_string_int(DltContext *handle, DltLogLevelType loglevel, const char *text, int data)
{
    if (!is_verbose_mode(dlt_user.verbose_mode, NULL))
        return DLT_RETURN_ERROR;

    if ((handle == NULL) || (text == NULL))
        return DLT_RETURN_WRONG_PARAMETER;

    DltReturnValue ret = DLT_RETURN_OK;
    DltContextData log;

    if (dlt_user_log_write_start(handle, &log, loglevel) == DLT_RETURN_TRUE) {
        ret = dlt_user_log_write_string(&log, text);
        dlt_user_log_write_int(&log, data);

        if (dlt_user_log_write_finish(&log) < DLT_RETURN_OK)
            ret = DLT_RETURN_ERROR;
    }

    return ret;
}

DltReturnValue dlt_log_string_uint(DltContext *handle, DltLogLevelType loglevel, const char *text, unsigned int data)
{
    if (!is_verbose_mode(dlt_user.verbose_mode, NULL))
        return DLT_RETURN_ERROR;

    if ((handle == NULL) || (text == NULL))
        return DLT_RETURN_WRONG_PARAMETER;

    DltReturnValue ret = DLT_RETURN_OK;
    DltContextData log;

    if (dlt_user_log_write_start(handle, &log, loglevel) == DLT_RETURN_TRUE) {
        ret = dlt_user_log_write_string(&log, text);
        dlt_user_log_write_uint(&log, data);

        if (dlt_user_log_write_finish(&log) < DLT_RETURN_OK)
            ret = DLT_RETURN_ERROR;
    }

    return ret;
}

DltReturnValue dlt_log_int(DltContext *handle, DltLogLevelType loglevel, int data)
{
    if (!is_verbose_mode(dlt_user.verbose_mode, NULL))
        return DLT_RETURN_ERROR;

    if (handle == NULL)
        return DLT_RETURN_ERROR;

    DltContextData log;

    if (dlt_user_log_write_start(handle, &log, loglevel) == DLT_RETURN_TRUE) {
        dlt_user_log_write_int(&log, data);

        if (dlt_user_log_write_finish(&log) < DLT_RETURN_OK)
            return DLT_RETURN_ERROR;
    }

    return DLT_RETURN_OK;
}

DltReturnValue dlt_log_uint(DltContext *handle, DltLogLevelType loglevel, unsigned int data)
{
    if (!is_verbose_mode(dlt_user.verbose_mode, NULL))
        return DLT_RETURN_ERROR;

    if (handle == NULL)
        return DLT_RETURN_WRONG_PARAMETER;

    DltContextData log;

    if (dlt_user_log_write_start(handle, &log, loglevel) == DLT_RETURN_TRUE) {
        dlt_user_log_write_uint(&log, data);

        if (dlt_user_log_write_finish(&log) < DLT_RETURN_OK)
            return DLT_RETURN_ERROR;
    }

    return DLT_RETURN_OK;
}

DltReturnValue dlt_log_raw(DltContext *handle, DltLogLevelType loglevel, void *data, uint16_t length)
{
    if (!is_verbose_mode(dlt_user.verbose_mode, NULL))
        return DLT_RETURN_ERROR;

    if (handle == NULL)
        return DLT_RETURN_WRONG_PARAMETER;

    DltContextData log;
    DltReturnValue ret = DLT_RETURN_OK;

    if (dlt_user_log_write_start(handle, &log, loglevel) > 0) {
        if ((ret = dlt_user_log_write_raw(&log, data, length)) < DLT_RETURN_OK) {
            dlt_user_free_buffer(&(log.buffer));
            return ret;
        }

        if (dlt_user_log_write_finish(&log) < DLT_RETURN_OK)
            return DLT_RETURN_ERROR;
    }

    return DLT_RETURN_OK;
}

DltReturnValue dlt_log_marker()
{
    if (!dlt_user_initialised) {
        if (dlt_init() < DLT_RETURN_OK) {
            dlt_vlog(LOG_ERR, "%s Failed to initialise dlt", __FUNCTION__);
            return DLT_RETURN_ERROR;
        }
    }

    return dlt_user_log_send_marker();
}

DltReturnValue dlt_verbose_mode(void)
{
    if (!dlt_user_initialised) {
        if (dlt_init() < DLT_RETURN_OK) {
            dlt_vlog(LOG_ERR, "%s Failed to initialise dlt", __FUNCTION__);
            return DLT_RETURN_ERROR;
        }
    }

    /* Switch to verbose mode */
    dlt_user.verbose_mode = 1;

    return DLT_RETURN_OK;
}

DltReturnValue dlt_nonverbose_mode(void)
{
    if (!dlt_user_initialised) {
        if (dlt_init() < DLT_RETURN_OK) {
            dlt_vlog(LOG_ERR, "%s Failed to initialise dlt", __FUNCTION__);
            return DLT_RETURN_ERROR;
        }
    }

    /* Switch to non-verbose mode */
    dlt_user.verbose_mode = 0;

    return DLT_RETURN_OK;
}

DltReturnValue dlt_use_extended_header_for_non_verbose(int8_t use_extended_header_for_non_verbose)
{
    if (!dlt_user_initialised) {
        if (dlt_init() < DLT_RETURN_OK) {
            dlt_vlog(LOG_ERR, "%s Failed to initialise dlt", __FUNCTION__);
            return DLT_RETURN_ERROR;
        }
    }

    /* Set use_extended_header_for_non_verbose */
    dlt_user.use_extended_header_for_non_verbose = use_extended_header_for_non_verbose;

    return DLT_RETURN_OK;
}

DltReturnValue dlt_with_session_id(int8_t with_session_id)
{
    if (!dlt_user_initialised) {
        if (dlt_init() < DLT_RETURN_OK) {
            dlt_vlog(LOG_ERR, "%s Failed to initialise dlt", __FUNCTION__);
            return DLT_RETURN_ERROR;
        }
    }

    /* Set use_extended_header_for_non_verbose */
    dlt_user.with_session_id = with_session_id;

    return DLT_RETURN_OK;
}

DltReturnValue dlt_with_timestamp(int8_t with_timestamp)
{
    if (!dlt_user_initialised) {
        if (dlt_init() < DLT_RETURN_OK) {
            dlt_vlog(LOG_ERR, "%s Failed to initialise dlt", __FUNCTION__);
            return DLT_RETURN_ERROR;
        }
    }

    /* Set with_timestamp */
    dlt_user.with_timestamp = with_timestamp;

    return DLT_RETURN_OK;
}

DltReturnValue dlt_with_ecu_id(int8_t with_ecu_id)
{
    if (!dlt_user_initialised) {
        if (dlt_init() < DLT_RETURN_OK) {
            dlt_vlog(LOG_ERR, "%s Failed to initialise dlt", __FUNCTION__);
            return DLT_RETURN_ERROR;
        }
    }

    /* Set with_timestamp */
    dlt_user.with_ecu_id = with_ecu_id;

    return DLT_RETURN_OK;
}

DltReturnValue dlt_enable_local_print(void)
{
    if (!dlt_user_initialised) {
        if (dlt_init() < DLT_RETURN_OK) {
            dlt_vlog(LOG_ERR, "%s Failed to initialise dlt", __FUNCTION__);
            return DLT_RETURN_ERROR;
        }
    }

    dlt_user.enable_local_print = 1;

    return DLT_RETURN_OK;
}

DltReturnValue dlt_disable_local_print(void)
{
    if (!dlt_user_initialised) {
        if (dlt_init() < DLT_RETURN_OK) {
            dlt_vlog(LOG_ERR, "%s Failed to initialise dlt", __FUNCTION__);
            return DLT_RETURN_ERROR;
        }
    }

    dlt_user.enable_local_print = 0;

    return DLT_RETURN_OK;
}

/* Cleanup on thread cancellation, thread may hold lock release it here */
static void dlt_user_cleanup_handler(void *arg)
{
    DLT_UNUSED(arg); /* Satisfy compiler */

#ifdef DLT_NETWORK_TRACE_ENABLE
    /* unlock the message queue */
    dlt_unlock_mutex(&mq_mutex);
#endif

    /* unlock DLT (dlt_mutex) */
    DLT_SEM_FREE();
}

void dlt_user_housekeeperthread_function(__attribute__((unused)) void *ptr)
{
    struct timespec ts;
    bool in_loop = true;

#ifdef __ANDROID_API__
    sigset_t set;
    sigset_t pset;
    /*
     * bionic is not supporting pthread_cancel so
     * use SIGUSR1 to kill thread properly.
     */
    sigemptyset(&set);
    sigaddset(&set, SIGUSR1);
    if (pthread_sigmask(SIG_BLOCK, &set, NULL) != 0) {
        dlt_vlog(LOG_ERR, "Failed to block signal with error [%s]\n",
                strerror(errno));
        in_loop = false;
    }
#endif

#ifdef DLT_USE_PTHREAD_SETNAME_NP
    if (pthread_setname_np(dlt_housekeeperthread_handle, "dlt_housekeeper"))
        dlt_log(LOG_WARNING, "Failed to rename housekeeper thread!\n");
#elif linux
    if (prctl(PR_SET_NAME, "dlt_housekeeper", 0, 0, 0) < 0)
        dlt_log(LOG_WARNING, "Failed to rename housekeeper thread!\n");
#endif

    pthread_cleanup_push(dlt_user_cleanup_handler, NULL);

    while (in_loop) {
        /* Check for new messages from DLT daemon */
        if (!dlt_user.disable_injection_msg)
            if (dlt_user_log_check_user_message() < DLT_RETURN_OK)
                /* Critical error */
                dlt_log(LOG_CRIT, "Housekeeper thread encountered error condition\n");

        /* Reattach to daemon if neccesary */
        dlt_user_log_reattach_to_daemon();

        /* flush buffer to DLT daemon if possible */
        if (dlt_user.dlt_log_handle != DLT_FD_INIT)
            dlt_user_log_resend_buffer();

#ifdef __ANDROID_API__
        if (sigpending(&pset)) {
            dlt_vlog(LOG_ERR, "sigpending failed with error [%s]!\n", strerror(errno));
            break;
        }

        if (sigismember(&pset, SIGUSR1)) {
            dlt_log(LOG_NOTICE, "Received SIGUSR1! Stop thread\n");
            break;
        }
#endif

        /* delay */
        ts.tv_sec = 0;
        ts.tv_nsec = DLT_USER_RECEIVE_NDELAY;
        nanosleep(&ts, NULL);
    }

    pthread_cleanup_pop(1);
}

/* Private functions of user library */

DltReturnValue dlt_user_log_init(DltContext *handle, DltContextData *log)
{
    int ret = DLT_RETURN_OK;

    if ((handle == NULL) || (log == NULL))
        return DLT_RETURN_WRONG_PARAMETER;

    if (!dlt_user_initialised) {
        ret = dlt_init();

        if (ret < DLT_RETURN_OK) {
            if (ret != DLT_RETURN_LOGGING_DISABLED)
                dlt_vlog(LOG_ERR, "%s Failed to initialise dlt", __FUNCTION__);

            return ret;
        }
    }

    log->handle = handle;
    log->buffer = NULL;
    return ret;
}

DltReturnValue dlt_user_log_send_log(DltContextData *log, int mtype)
{
    DltMessage msg;
    DltUserHeader userheader;
    int32_t len;

    DltReturnValue ret = DLT_RETURN_OK;

    if (!dlt_user_initialised) {
        dlt_vlog(LOG_ERR, "%s dlt_user_initialised false\n", __FUNCTION__);
        return DLT_RETURN_ERROR;
    }

    if ((log == NULL) ||
        (log->handle == NULL) ||
        (log->handle->contextID[0] == '\0') ||
        (mtype < DLT_TYPE_LOG) || (mtype > DLT_TYPE_CONTROL)
        )
        return DLT_RETURN_WRONG_PARAMETER;

    /* also for Trace messages */
    if (dlt_user_set_userheader(&userheader, DLT_USER_MESSAGE_LOG) < DLT_RETURN_OK)
        return DLT_RETURN_ERROR;

    if (dlt_message_init(&msg, 0) == DLT_RETURN_ERROR)
        return DLT_RETURN_ERROR;

    msg.storageheader = (DltStorageHeader *)msg.headerbuffer;

    if (dlt_set_storageheader(msg.storageheader, dlt_user.ecuID) == DLT_RETURN_ERROR)
        return DLT_RETURN_ERROR;

    msg.standardheader = (DltStandardHeader *)(msg.headerbuffer + sizeof(DltStorageHeader));
    msg.standardheader->htyp = DLT_HTYP_PROTOCOL_VERSION1;

    /* send ecu id */
    if (dlt_user.with_ecu_id)
        msg.standardheader->htyp |= DLT_HTYP_WEID;

    /* send timestamp */
    if (dlt_user.with_timestamp)
        msg.standardheader->htyp |= DLT_HTYP_WTMS;

    /* send session id */
    if (dlt_user.with_session_id) {
        msg.standardheader->htyp |= DLT_HTYP_WSID;
        msg.headerextra.seid = (uint32_t) getpid();
    }

    if (is_verbose_mode(dlt_user.verbose_mode, log))
        /* In verbose mode, send extended header */
        msg.standardheader->htyp = (msg.standardheader->htyp | DLT_HTYP_UEH);
    else
        /* In non-verbose, send extended header if desired */
        if (dlt_user.use_extended_header_for_non_verbose)
            msg.standardheader->htyp = (msg.standardheader->htyp | DLT_HTYP_UEH);

#if (BYTE_ORDER == BIG_ENDIAN)
    msg.standardheader->htyp = (msg.standardheader->htyp | DLT_HTYP_MSBF);
#endif

    msg.standardheader->mcnt = log->handle->mcnt++;

    /* Set header extra parameters */
    dlt_set_id(msg.headerextra.ecu, dlt_user.ecuID);

    /*msg.headerextra.seid = 0; */
    if (log->use_timestamp == DLT_AUTO_TIMESTAMP) {
        msg.headerextra.tmsp = dlt_uptime();
    }
    else {
        msg.headerextra.tmsp = log->user_timestamp;
    }

    if (dlt_message_set_extraparameters(&msg, 0) == DLT_RETURN_ERROR)
        return DLT_RETURN_ERROR;

    /* Fill out extended header, if extended header should be provided */
    if (DLT_IS_HTYP_UEH(msg.standardheader->htyp)) {
        /* with extended header */
        msg.extendedheader =
            (DltExtendedHeader *)(msg.headerbuffer + sizeof(DltStorageHeader) + sizeof(DltStandardHeader) +
                                  DLT_STANDARD_HEADER_EXTRA_SIZE(msg.standardheader->htyp));

        switch (mtype) {
        case DLT_TYPE_LOG:
        {
            msg.extendedheader->msin = (uint8_t) (DLT_TYPE_LOG << DLT_MSIN_MSTP_SHIFT |
                ((log->log_level << DLT_MSIN_MTIN_SHIFT) & DLT_MSIN_MTIN));
            break;
        }
        case DLT_TYPE_NW_TRACE:
        {
            msg.extendedheader->msin = (uint8_t) (DLT_TYPE_NW_TRACE << DLT_MSIN_MSTP_SHIFT |
                ((log->trace_status << DLT_MSIN_MTIN_SHIFT) & DLT_MSIN_MTIN));
            break;
        }
        default:
        {
            /* This case should not occur */
            return DLT_RETURN_ERROR;
            break;
        }
        }

        /* If in verbose mode, set flag in header for verbose mode */
        if (is_verbose_mode(dlt_user.verbose_mode, log))
            msg.extendedheader->msin |= DLT_MSIN_VERB;

        msg.extendedheader->noar = (uint8_t) log->args_num;              /* number of arguments */
        dlt_set_id(msg.extendedheader->apid, dlt_user.appID);       /* application id */
        dlt_set_id(msg.extendedheader->ctid, log->handle->contextID);   /* context id */

        msg.headersize = (uint32_t) (sizeof(DltStorageHeader) + sizeof(DltStandardHeader) + sizeof(DltExtendedHeader) +
            DLT_STANDARD_HEADER_EXTRA_SIZE(msg.standardheader->htyp));
    }
    else {
        /* without extended header */
        msg.headersize = (uint32_t) (sizeof(DltStorageHeader) + sizeof(DltStandardHeader) + DLT_STANDARD_HEADER_EXTRA_SIZE(
            msg.standardheader->htyp));
    }

    len = (int32_t) (msg.headersize - sizeof(DltStorageHeader) + log->size);

    if (len > UINT16_MAX) {
        dlt_log(LOG_WARNING, "Huge message discarded!\n");
        return DLT_RETURN_ERROR;
    }

    msg.standardheader->len = DLT_HTOBE_16(len);

    /* print to std out, if enabled */
    if ((dlt_user.local_print_mode != DLT_PM_FORCE_OFF) &&
        (dlt_user.local_print_mode != DLT_PM_AUTOMATIC)) {
        if ((dlt_user.enable_local_print) || (dlt_user.local_print_mode == DLT_PM_FORCE_ON))
            if (dlt_user_print_msg(&msg, log) == DLT_RETURN_ERROR)
                return DLT_RETURN_ERROR;
    }

    if (dlt_user.dlt_is_file) {
        if (dlt_user_file_reach_max) {
            return DLT_RETURN_FILESZERR;
        }
        else {
            /* Get file size */
            struct stat st;
            fstat(dlt_user.dlt_log_handle, &st);
            dlt_vlog(LOG_DEBUG, "%s: Current file size=[%ld]\n", __func__,
                     st.st_size);

            /* Check filesize */
            /* Return error if the file size has reached to maximum */
            unsigned int msg_size = st.st_size + (unsigned int) msg.headersize +
                                    (unsigned int) log->size;
            if (msg_size > dlt_user.filesize_max) {
                dlt_user_file_reach_max = true;
                dlt_vlog(LOG_ERR,
                         "%s: File size (%ld bytes) reached to defined maximum size (%d bytes)\n",
                         __func__, st.st_size, dlt_user.filesize_max);
                return DLT_RETURN_FILESZERR;
            }
            else {
                /* log to file */
                ret = dlt_user_log_out2(dlt_user.dlt_log_handle,
                                        msg.headerbuffer, msg.headersize,
                                        log->buffer, log->size);
                return ret;
            }
        }
    } else {
        if (dlt_user.overflow_counter) {
            if (dlt_user_log_send_overflow() == DLT_RETURN_OK) {
                dlt_vnlog(LOG_WARNING, DLT_USER_BUFFER_LENGTH, "%u messages discarded!\n", dlt_user.overflow_counter);
                dlt_user.overflow_counter = 0;
            }
        }

        /* try to resent old data first */
        ret = DLT_RETURN_OK;

        if ((dlt_user.dlt_log_handle != -1) && (dlt_user.appID[0] != '\0'))
            ret = dlt_user_log_resend_buffer();

        if ((ret == DLT_RETURN_OK) && (dlt_user.appID[0] != '\0')) {
            /* resend ok or nothing to resent */
#ifdef DLT_SHM_ENABLE

            if (dlt_user.dlt_log_handle != -1)
                dlt_shm_push(&dlt_user.dlt_shm, msg.headerbuffer + sizeof(DltStorageHeader),
                             msg.headersize - sizeof(DltStorageHeader),
                             log->buffer, log->size, 0, 0);

            ret = dlt_user_log_out3(dlt_user.dlt_log_handle,
                                    &(userheader), sizeof(DltUserHeader),
                                    0, 0,
                                    0, 0);
#else
#   ifdef DLT_TEST_ENABLE

            if (dlt_user.corrupt_user_header) {
                userheader.pattern[0] = (char) 0xff;
                userheader.pattern[1] = (char) 0xff;
                userheader.pattern[2] = (char) 0xff;
                userheader.pattern[3] = (char) 0xff;
            }

            if (dlt_user.corrupt_message_size)
                msg.standardheader->len = DLT_HTOBE_16(dlt_user.corrupt_message_size_size);

#   endif

            ret = dlt_user_log_out3(dlt_user.dlt_log_handle,
                                    &(userheader), sizeof(DltUserHeader),
                                    msg.headerbuffer + sizeof(DltStorageHeader),
                                    msg.headersize - sizeof(DltStorageHeader),
                                    log->buffer, log->size);
#endif
        }

        DltReturnValue process_error_ret = DLT_RETURN_OK;
        /* store message in ringbuffer, if an error has occured */
        if ((ret != DLT_RETURN_OK) || (dlt_user.appID[0] == '\0'))
            process_error_ret = dlt_user_log_out_error_handling(&(userheader),
                                                  sizeof(DltUserHeader),
                                                  msg.headerbuffer + sizeof(DltStorageHeader),
                                                  msg.headersize - sizeof(DltStorageHeader),
                                                  log->buffer,
                                                  log->size);

        if (process_error_ret == DLT_RETURN_OK)
            return DLT_RETURN_OK;
        if (process_error_ret == DLT_RETURN_BUFFER_FULL) {
            /* Buffer full */
            dlt_user.overflow_counter += 1;
            return DLT_RETURN_BUFFER_FULL;
        }

        /* handle return value of function dlt_user_log_out3() when process_error_ret < 0*/
        switch (ret) {
            case DLT_RETURN_PIPE_FULL:
            {
                /* data could not be written */
                return DLT_RETURN_PIPE_FULL;
            }
            case DLT_RETURN_PIPE_ERROR:
            {
                /* handle not open or pipe error */
                close(dlt_user.dlt_log_handle);
                dlt_user.dlt_log_handle = -1;
#if defined DLT_LIB_USE_UNIX_SOCKET_IPC || defined DLT_LIB_USE_VSOCK_IPC
            dlt_user.connection_state = DLT_USER_RETRY_CONNECT;
#endif

    #ifdef DLT_SHM_ENABLE
            /* free shared memory */
            dlt_shm_free_client(&dlt_user.dlt_shm);
    #endif

            if (dlt_user.local_print_mode == DLT_PM_AUTOMATIC)
                dlt_user_print_msg(&msg, log);

            return DLT_RETURN_PIPE_ERROR;
        }
        case DLT_RETURN_ERROR:
        {
            /* other error condition */
            return DLT_RETURN_ERROR;
        }
        case DLT_RETURN_OK:
        {
            return DLT_RETURN_OK;
        }
        default:
        {
            /* This case should never occur. */
            return DLT_RETURN_ERROR;
        }
        }
    }

    return DLT_RETURN_OK;
}

DltReturnValue dlt_user_log_send_register_application(void)
{
    DltUserHeader userheader;
    DltUserControlMsgRegisterApplication usercontext;

    DltReturnValue ret;

    if (dlt_user.appID[0] == '\0')
        return DLT_RETURN_ERROR;

    /* set userheader */
    if (dlt_user_set_userheader(&userheader, DLT_USER_MESSAGE_REGISTER_APPLICATION) < DLT_RETURN_OK)
        return DLT_RETURN_ERROR;

    /* set usercontext */
    dlt_set_id(usercontext.apid, dlt_user.appID);       /* application id */
    usercontext.pid = getpid();

    if (dlt_user.application_description != NULL)
        usercontext.description_length = (uint32_t) strlen(dlt_user.application_description);
    else
        usercontext.description_length = 0;

    if (dlt_user.dlt_is_file)
        return DLT_RETURN_OK;

    ret = dlt_user_log_out3(dlt_user.dlt_log_handle,
                            &(userheader), sizeof(DltUserHeader),
                            &(usercontext), sizeof(DltUserControlMsgRegisterApplication),
                            dlt_user.application_description, usercontext.description_length);

    /* store message in ringbuffer, if an error has occured */
    if (ret < DLT_RETURN_OK)
        return dlt_user_log_out_error_handling(&(userheader),
                                               sizeof(DltUserHeader),
                                               &(usercontext),
                                               sizeof(DltUserControlMsgRegisterApplication),
                                               dlt_user.application_description,
                                               usercontext.description_length);

    return DLT_RETURN_OK;
}

DltReturnValue dlt_user_log_send_unregister_application(void)
{
    DltUserHeader userheader;
    DltUserControlMsgUnregisterApplication usercontext;
    DltReturnValue ret = DLT_RETURN_OK;

    if (dlt_user.appID[0] == '\0')
        return DLT_RETURN_ERROR;

    /* set userheader */
    if (dlt_user_set_userheader(&userheader, DLT_USER_MESSAGE_UNREGISTER_APPLICATION) < DLT_RETURN_OK)
        return DLT_RETURN_ERROR;

    /* set usercontext */
    dlt_set_id(usercontext.apid, dlt_user.appID);       /* application id */
    usercontext.pid = getpid();

    if (dlt_user.dlt_is_file)
        return DLT_RETURN_OK;

    ret = dlt_user_log_out2(dlt_user.dlt_log_handle,
                            &(userheader), sizeof(DltUserHeader),
                            &(usercontext), sizeof(DltUserControlMsgUnregisterApplication));

    /* store message in ringbuffer, if an error has occured */
    if (ret < DLT_RETURN_OK)
        return dlt_user_log_out_error_handling(&(userheader),
                                               sizeof(DltUserHeader),
                                               &(usercontext),
                                               sizeof(DltUserControlMsgUnregisterApplication),
                                               NULL,
                                               0);

    return DLT_RETURN_OK;
}

DltReturnValue dlt_user_log_send_register_context(DltContextData *log)
{
    DltUserHeader userheader;
    DltUserControlMsgRegisterContext usercontext;
    DltReturnValue ret = DLT_RETURN_ERROR;

    if (log == NULL)
        return DLT_RETURN_WRONG_PARAMETER;

    if (log->handle == NULL)
        return DLT_RETURN_ERROR;

    if (log->handle->contextID[0] == '\0')
        return DLT_RETURN_ERROR;

    /* set userheader */
    if (dlt_user_set_userheader(&userheader, DLT_USER_MESSAGE_REGISTER_CONTEXT) < DLT_RETURN_OK)
        return DLT_RETURN_ERROR;

    /* set usercontext */
    dlt_set_id(usercontext.apid, dlt_user.appID);       /* application id */
    dlt_set_id(usercontext.ctid, log->handle->contextID);       /* context id */
    usercontext.log_level_pos = log->handle->log_level_pos;
    usercontext.pid = getpid();

    usercontext.log_level = (int8_t) log->log_level;
    usercontext.trace_status = (int8_t) log->trace_status;

    if (log->context_description != NULL)
        usercontext.description_length = (uint32_t) strlen(log->context_description);
    else
        usercontext.description_length = 0;

    if (dlt_user.dlt_is_file)
        return DLT_RETURN_OK;

    if (dlt_user.appID[0] != '\0')
        ret =
            dlt_user_log_out3(dlt_user.dlt_log_handle,
                              &(userheader),
                              sizeof(DltUserHeader),
                              &(usercontext),
                              sizeof(DltUserControlMsgRegisterContext),
                              log->context_description,
                              usercontext.description_length);

    /* store message in ringbuffer, if an error has occured */
    if ((ret != DLT_RETURN_OK) || (dlt_user.appID[0] == '\0'))
        return dlt_user_log_out_error_handling(&(userheader),
                                               sizeof(DltUserHeader),
                                               &(usercontext),
                                               sizeof(DltUserControlMsgRegisterContext),
                                               log->context_description,
                                               usercontext.description_length);

    return DLT_RETURN_OK;

}

DltReturnValue dlt_user_log_send_unregister_context(DltContextData *log)
{
    DltUserHeader userheader;
    DltUserControlMsgUnregisterContext usercontext;
    DltReturnValue ret;

    if (log == NULL)
        return DLT_RETURN_WRONG_PARAMETER;

    if (log->handle == NULL)
        return DLT_RETURN_WRONG_PARAMETER;

    if (log->handle->contextID[0] == '\0')
        return DLT_RETURN_ERROR;

    /* set userheader */
    if (dlt_user_set_userheader(&userheader, DLT_USER_MESSAGE_UNREGISTER_CONTEXT) < DLT_RETURN_OK)
        return DLT_RETURN_ERROR;

    /* set usercontext */
    dlt_set_id(usercontext.apid, dlt_user.appID);       /* application id */
    dlt_set_id(usercontext.ctid, log->handle->contextID);       /* context id */
    usercontext.pid = getpid();

    if (dlt_user.dlt_is_file)
        return DLT_RETURN_OK;

    ret = dlt_user_log_out2(dlt_user.dlt_log_handle,
                            &(userheader),
                            sizeof(DltUserHeader),
                            &(usercontext),
                            sizeof(DltUserControlMsgUnregisterContext));

    /* store message in ringbuffer, if an error has occured */
    if (ret < DLT_RETURN_OK)
        return dlt_user_log_out_error_handling(&(userheader),
                                               sizeof(DltUserHeader),
                                               &(usercontext),
                                               sizeof(DltUserControlMsgUnregisterContext),
                                               NULL,
                                               0);

    return DLT_RETURN_OK;
}

DltReturnValue dlt_send_app_ll_ts_limit(const char *apid, DltLogLevelType loglevel, DltTraceStatusType tracestatus)
{
    DltUserHeader userheader;
    DltUserControlMsgAppLogLevelTraceStatus usercontext;
    DltReturnValue ret;

    if ((loglevel < DLT_USER_LOG_LEVEL_NOT_SET) || (loglevel >= DLT_LOG_MAX)) {
        dlt_vlog(LOG_ERR, "Loglevel %d is outside valid range", loglevel);
        return DLT_RETURN_ERROR;
    }

    if ((tracestatus < DLT_USER_TRACE_STATUS_NOT_SET) || (tracestatus >= DLT_TRACE_STATUS_MAX)) {
        dlt_vlog(LOG_ERR, "Tracestatus %d is outside valid range", tracestatus);
        return DLT_RETURN_ERROR;
    }

    if ((apid == NULL) || (apid[0] == '\0'))
        return DLT_RETURN_ERROR;

    /* set userheader */
    if (dlt_user_set_userheader(&userheader, DLT_USER_MESSAGE_APP_LL_TS) < DLT_RETURN_OK)
        return DLT_RETURN_ERROR;

    /* set usercontext */
    dlt_set_id(usercontext.apid, apid);       /* application id */
    usercontext.log_level = loglevel;
    usercontext.trace_status = tracestatus;

    if (dlt_user.dlt_is_file)
        return DLT_RETURN_OK;

    ret = dlt_user_log_out2(dlt_user.dlt_log_handle,
                            &(userheader), sizeof(DltUserHeader),
                            &(usercontext), sizeof(DltUserControlMsgAppLogLevelTraceStatus));

    /* store message in ringbuffer, if an error has occured */
    if (ret < DLT_RETURN_OK)
        return dlt_user_log_out_error_handling(&(userheader),
                                               sizeof(DltUserHeader),
                                               &(usercontext),
                                               sizeof(DltUserControlMsgAppLogLevelTraceStatus),
                                               NULL,
                                               0);

    return DLT_RETURN_OK;
}

DltReturnValue dlt_user_log_send_log_mode(DltUserLogMode mode)
{
    DltUserHeader userheader;
    DltUserControlMsgLogMode logmode;
    DltReturnValue ret;

    if ((mode < DLT_USER_MODE_UNDEFINED) || (mode >= DLT_USER_MODE_MAX)) {
        dlt_vlog(LOG_ERR, "User log mode %d is outside valid range", mode);
        return DLT_RETURN_WRONG_PARAMETER;
    }

    /* set userheader */
    if (dlt_user_set_userheader(&userheader, DLT_USER_MESSAGE_LOG_MODE) < DLT_RETURN_OK)
        return DLT_RETURN_ERROR;

    /* set data */
    logmode.log_mode = (unsigned char)mode;

    if (dlt_user.dlt_is_file)
        return DLT_RETURN_OK;

    ret = dlt_user_log_out2(dlt_user.dlt_log_handle,
                            &(userheader), sizeof(DltUserHeader),
                            &(logmode), sizeof(DltUserControlMsgLogMode));

    /* store message in ringbuffer, if an error has occured */
    if (ret < DLT_RETURN_OK)
        return dlt_user_log_out_error_handling(&(userheader),
                                               sizeof(DltUserHeader),
                                               &(logmode),
                                               sizeof(DltUserControlMsgLogMode),
                                               NULL,
                                               0);

    return DLT_RETURN_OK;
}

DltReturnValue dlt_user_log_send_marker()
{
    DltUserHeader userheader;
    DltReturnValue ret;

    /* set userheader */
    if (dlt_user_set_userheader(&userheader, DLT_USER_MESSAGE_MARKER) < DLT_RETURN_OK)
        return DLT_RETURN_ERROR;

    if (dlt_user.dlt_is_file)
        return DLT_RETURN_OK;

    /* log to FIFO */
    ret = dlt_user_log_out2(dlt_user.dlt_log_handle,
                            &(userheader), sizeof(DltUserHeader), 0, 0);

    /* store message in ringbuffer, if an error has occured */
    if (ret < DLT_RETURN_OK)
        return dlt_user_log_out_error_handling(&(userheader),
                                               sizeof(DltUserHeader),
                                               NULL,
                                               0,
                                               NULL,
                                               0);

    return DLT_RETURN_OK;
}

DltReturnValue dlt_user_print_msg(DltMessage *msg, DltContextData *log)
{
    uint8_t *databuffer_tmp;
    uint32_t datasize_tmp;
    uint32_t databuffersize_tmp;
    static char text[DLT_USER_TEXT_LENGTH];

    if ((msg == NULL) || (log == NULL))
        return DLT_RETURN_WRONG_PARAMETER;

    /* Save variables before print */
    databuffer_tmp = msg->databuffer;
    datasize_tmp = msg->datasize;
    databuffersize_tmp = msg->databuffersize;

    /* Act like a receiver, convert header back to host format */
    msg->standardheader->len = DLT_BETOH_16(msg->standardheader->len);
    dlt_message_get_extraparameters(msg, 0);

    msg->databuffer = log->buffer;
    msg->datasize = (uint32_t) log->size;
    msg->databuffersize = (uint32_t) log->size;

    /* Print message as ASCII */
    if (dlt_message_print_ascii(msg, text, DLT_USER_TEXT_LENGTH, 0) == DLT_RETURN_ERROR)
        return DLT_RETURN_ERROR;

    /* Restore variables and set len to BE*/
    msg->databuffer = databuffer_tmp;
    msg->databuffersize = databuffersize_tmp;
    msg->datasize = datasize_tmp;

    msg->standardheader->len = DLT_HTOBE_16(msg->standardheader->len);

    return DLT_RETURN_OK;
}

DltReturnValue dlt_user_log_check_user_message(void)
{
    int offset = 0;
    int leave_while = 0;
    int ret = 0;

    uint32_t i;
    int fd;
    struct pollfd nfd[1];

    DltUserHeader *userheader;
    DltReceiver *receiver = &(dlt_user.receiver);

    DltUserControlMsgLogLevel *usercontextll;
    DltUserControlMsgInjection *usercontextinj;
    DltUserControlMsgLogState *userlogstate;
    unsigned char *userbuffer;

    /* For delayed calling of injection callback, to avoid deadlock */
    DltUserInjectionCallback delayed_injection_callback;
    DltUserLogLevelChangedCallback delayed_log_level_changed_callback;
    unsigned char *delayed_inject_buffer = 0;
    uint32_t delayed_inject_data_length = 0;

    /* Ensure that callback is null before searching for it */
    delayed_injection_callback.injection_callback = 0;
    delayed_injection_callback.injection_callback_with_id = 0;
    delayed_injection_callback.service_id = 0;
    delayed_log_level_changed_callback.log_level_changed_callback = 0;
    delayed_injection_callback.data = 0;

#if defined DLT_LIB_USE_UNIX_SOCKET_IPC || defined DLT_LIB_USE_VSOCK_IPC
    fd = dlt_user.dlt_log_handle;
#else /* DLT_LIB_USE_FIFO_IPC */
    fd = dlt_user.dlt_user_handle;
#endif
    nfd[0].events = POLLIN;
    nfd[0].fd = fd;

    if (fd >= 0) {
        ret = poll(nfd, 1, DLT_USER_RECEIVE_MDELAY);
        if (ret) {
            if (nfd[0].revents & (POLLHUP | POLLNVAL | POLLERR)) {
                dlt_user.dlt_log_handle = DLT_FD_INIT;
                return DLT_RETURN_ERROR;
            }

            if (dlt_receiver_receive(receiver) <= 0)
                /* No new message available */
                return DLT_RETURN_OK;

            /* look through buffer as long as data is in there */
            while (1) {
                if (receiver->bytesRcvd < (int32_t) sizeof(DltUserHeader))
                    break;

                /* resync if necessary */
                offset = 0;

                do {
                    userheader = (DltUserHeader *)(receiver->buf + offset);

                    /* Check for user header pattern */
                    if (dlt_user_check_userheader(userheader))
                        break;

                    offset++;

                } while (((int32_t) (sizeof(DltUserHeader)) + offset) <= receiver->bytesRcvd);

                /* Check for user header pattern */
                if ((dlt_user_check_userheader(userheader) < 0) ||
                    (dlt_user_check_userheader(userheader) == 0))
                    break;

                /* Set new start offset */
                if (offset > 0) {
                    receiver->buf += offset;
                    receiver->bytesRcvd -= offset;
                }

                switch (userheader->message) {
                case DLT_USER_MESSAGE_LOG_LEVEL:
                {
                    if (receiver->bytesRcvd < (int32_t) (sizeof(DltUserHeader) + sizeof(DltUserControlMsgLogLevel))) {
                        leave_while = 1;
                        break;
                    }

                    usercontextll = (DltUserControlMsgLogLevel *)(receiver->buf + sizeof(DltUserHeader));

                    /* Update log level and trace status */
                    if (usercontextll != NULL) {
                        DLT_SEM_LOCK();

                        if ((usercontextll->log_level_pos >= 0) &&
                            (usercontextll->log_level_pos < (int32_t)dlt_user.dlt_ll_ts_num_entries)) {
                            if (dlt_user.dlt_ll_ts) {
                                dlt_user.dlt_ll_ts[usercontextll->log_level_pos].log_level = (int8_t) usercontextll->log_level;
                                dlt_user.dlt_ll_ts[usercontextll->log_level_pos].trace_status =
                                    (int8_t) usercontextll->trace_status;

                                if (dlt_user.dlt_ll_ts[usercontextll->log_level_pos].log_level_ptr)
                                    *(dlt_user.dlt_ll_ts[usercontextll->log_level_pos].log_level_ptr) =
                                        (int8_t) usercontextll->log_level;

                                if (dlt_user.dlt_ll_ts[usercontextll->log_level_pos].trace_status_ptr)
                                    *(dlt_user.dlt_ll_ts[usercontextll->log_level_pos].trace_status_ptr) =
                                        (int8_t) usercontextll->trace_status;

                                delayed_log_level_changed_callback.log_level_changed_callback =
                                    dlt_user.dlt_ll_ts[usercontextll->log_level_pos].log_level_changed_callback;
                                memcpy(delayed_log_level_changed_callback.contextID,
                                       dlt_user.dlt_ll_ts[usercontextll->log_level_pos].contextID, DLT_ID_SIZE);
                                delayed_log_level_changed_callback.log_level = (int8_t) usercontextll->log_level;
                                delayed_log_level_changed_callback.trace_status = (int8_t) usercontextll->trace_status;
                            }
                        }

                        DLT_SEM_FREE();
                    }

                    /* call callback outside of semaphore */
                    if (delayed_log_level_changed_callback.log_level_changed_callback != 0)
                        delayed_log_level_changed_callback.log_level_changed_callback(
                            delayed_log_level_changed_callback.contextID,
                            (uint8_t) delayed_log_level_changed_callback.log_level,
                            (uint8_t) delayed_log_level_changed_callback.trace_status);

                    /* keep not read data in buffer */
                    if (dlt_receiver_remove(receiver,
                                            sizeof(DltUserHeader) + sizeof(DltUserControlMsgLogLevel)) ==
                        DLT_RETURN_ERROR)
                        return DLT_RETURN_ERROR;
                }
                break;
                case DLT_USER_MESSAGE_INJECTION:
                {
                    /* At least, user header, user context, and service id and data_length of injected message is available */
                    if (receiver->bytesRcvd < (int32_t) (sizeof(DltUserHeader) + sizeof(DltUserControlMsgInjection))) {
                        leave_while = 1;
                        break;
                    }

                    usercontextinj = (DltUserControlMsgInjection *)(receiver->buf + sizeof(DltUserHeader));
                    userbuffer =
                        (unsigned char *)(receiver->buf + sizeof(DltUserHeader) + sizeof(DltUserControlMsgInjection));

                    if (userbuffer != NULL) {

                        if (receiver->bytesRcvd <
                            (int32_t) (sizeof(DltUserHeader) + sizeof(DltUserControlMsgInjection) +
                                      usercontextinj->data_length_inject)) {
                            leave_while = 1;
                            break;
                        }

                        DLT_SEM_LOCK();

                        if ((usercontextinj->data_length_inject > 0) && (dlt_user.dlt_ll_ts))
                            /* Check if injection callback is registered for this context */
                            for (i = 0; i < dlt_user.dlt_ll_ts[usercontextinj->log_level_pos].nrcallbacks; i++)
                                if ((dlt_user.dlt_ll_ts[usercontextinj->log_level_pos].injection_table) &&
                                    (dlt_user.dlt_ll_ts[usercontextinj->log_level_pos].injection_table[i].service_id ==
                                     usercontextinj->service_id)) {
                                    /* Prepare delayed injection callback call */
                                    if (dlt_user.dlt_ll_ts[usercontextinj->log_level_pos].injection_table[i].
                                        injection_callback != NULL) {
                                        delayed_injection_callback.injection_callback =
                                            dlt_user.dlt_ll_ts[usercontextinj->log_level_pos].injection_table[i].
                                            injection_callback;
                                    }
                                    else if (dlt_user.dlt_ll_ts[usercontextinj->log_level_pos].injection_table[i].
                                             injection_callback_with_id != NULL)
                                    {
                                        delayed_injection_callback.injection_callback_with_id =
                                            dlt_user.dlt_ll_ts[usercontextinj->log_level_pos].injection_table[i].
                                            injection_callback_with_id;
                                        delayed_injection_callback.data =
                                            dlt_user.dlt_ll_ts[usercontextinj->log_level_pos].injection_table[i].data;
                                    }

                                    delayed_injection_callback.service_id = usercontextinj->service_id;
                                    delayed_inject_data_length = usercontextinj->data_length_inject;
                                    delayed_inject_buffer = malloc(delayed_inject_data_length);

                                    if (delayed_inject_buffer != NULL) {
                                        memcpy(delayed_inject_buffer, userbuffer, delayed_inject_data_length);
                                    }
                                    else {
                                        DLT_SEM_FREE();
                                        dlt_log(LOG_WARNING, "malloc failed!\n");
                                        return DLT_RETURN_ERROR;
                                    }

                                    break;
                                }

                        DLT_SEM_FREE();

                        /* Delayed injection callback call */
                        if ((delayed_inject_buffer != NULL) &&
                            (delayed_injection_callback.injection_callback != NULL)) {
                            delayed_injection_callback.injection_callback(delayed_injection_callback.service_id,
                                                                          delayed_inject_buffer,
                                                                          delayed_inject_data_length);
                            delayed_injection_callback.injection_callback = NULL;
                        }
                        else if ((delayed_inject_buffer != NULL) &&
                                 (delayed_injection_callback.injection_callback_with_id != NULL))
                        {
                            delayed_injection_callback.injection_callback_with_id(delayed_injection_callback.service_id,
                                                                                  delayed_inject_buffer,
                                                                                  delayed_inject_data_length,
                                                                                  delayed_injection_callback.data);
                            delayed_injection_callback.injection_callback_with_id = NULL;
                        }

                        free(delayed_inject_buffer);
                        delayed_inject_buffer = NULL;

                        /* keep not read data in buffer */
                        if (dlt_receiver_remove(receiver,
                                                (int) (sizeof(DltUserHeader) +
                                                 sizeof(DltUserControlMsgInjection) +
                                                 usercontextinj->data_length_inject)) != DLT_RETURN_OK)
                            return DLT_RETURN_ERROR;
                    }
                }
                break;
                case DLT_USER_MESSAGE_LOG_STATE:
                {
                    /* At least, user header, user context, and service id and data_length of injected message is available */
                    if (receiver->bytesRcvd < (int32_t) (sizeof(DltUserHeader) + sizeof(DltUserControlMsgLogState))) {
                        leave_while = 1;
                        break;
                    }

                    userlogstate = (DltUserControlMsgLogState *)(receiver->buf + sizeof(DltUserHeader));
                    dlt_user.log_state = userlogstate->log_state;

                    /* keep not read data in buffer */
                    if (dlt_receiver_remove(receiver,
                                            (sizeof(DltUserHeader) + sizeof(DltUserControlMsgLogState))) ==
                        DLT_RETURN_ERROR)
                        return DLT_RETURN_ERROR;
                }
                break;
                default:
                {
                    dlt_log(LOG_WARNING, "Invalid user message type received!\n");
                    /* Ignore result */
                    dlt_receiver_remove(receiver, sizeof(DltUserHeader));
                    /* In next invocation of while loop, a resync will be triggered if additional data was received */
                }
                break;
                } /* switch() */

                if (leave_while == 1) {
                    leave_while = 0;
                    break;
                }
            } /* while buffer*/

            if (dlt_receiver_move_to_begin(receiver) == DLT_RETURN_ERROR)
                return DLT_RETURN_ERROR;
        } /* while receive */

    } /* if */

    return DLT_RETURN_OK;
}

DltReturnValue dlt_user_log_resend_buffer(void)
{
    int num, count;
    int size;
    DltReturnValue ret;

    DLT_SEM_LOCK();

    if (dlt_user.appID[0] == '\0') {
        DLT_SEM_FREE();
        return 0;
    }

    /* Send content of ringbuffer */
    count = dlt_buffer_get_message_count(&(dlt_user.startup_buffer));
    DLT_SEM_FREE();

    for (num = 0; num < count; num++) {

        DLT_SEM_LOCK();
        size = dlt_buffer_copy(&(dlt_user.startup_buffer), dlt_user.resend_buffer, dlt_user.log_buf_len);

        if (size > 0) {
            DltUserHeader *userheader = (DltUserHeader *)(dlt_user.resend_buffer);

            /* Add application id to the messages of needed*/
            if (dlt_user_check_userheader(userheader)) {
                switch (userheader->message) {
                case DLT_USER_MESSAGE_REGISTER_CONTEXT:
                {
                    DltUserControlMsgRegisterContext *usercontext =
                        (DltUserControlMsgRegisterContext *)(dlt_user.resend_buffer + sizeof(DltUserHeader));

                    if ((usercontext != 0) && (usercontext->apid[0] == '\0'))
                        dlt_set_id(usercontext->apid, dlt_user.appID);

                    break;
                }
                case DLT_USER_MESSAGE_LOG:
                {
                    DltExtendedHeader *extendedHeader =
                        (DltExtendedHeader *)(dlt_user.resend_buffer + sizeof(DltUserHeader) +
                                              sizeof(DltStandardHeader) +
                                              sizeof(DltStandardHeaderExtra));

                    if (((extendedHeader) != 0) && (extendedHeader->apid[0] == '\0')) /* if application id is empty, add it */
                        dlt_set_id(extendedHeader->apid, dlt_user.appID);

                    break;
                }
                default:
                {
                    break;
                }
                }
            }

#ifdef DLT_SHM_ENABLE
            dlt_shm_push(&dlt_user.dlt_shm,
                         dlt_user.resend_buffer + sizeof(DltUserHeader),
                         size - sizeof(DltUserHeader),
                         0,
                         0,
                         0,
                         0);

            ret = dlt_user_log_out3(dlt_user.dlt_log_handle, dlt_user.resend_buffer, sizeof(DltUserHeader), 0, 0, 0, 0);
#else
            ret = dlt_user_log_out3(dlt_user.dlt_log_handle, dlt_user.resend_buffer, (size_t) size, 0, 0, 0, 0);
#endif

            /* in case of error, keep message in ringbuffer */
            if (ret == DLT_RETURN_OK) {
                dlt_buffer_remove(&(dlt_user.startup_buffer));
            }
            else {
                if (ret == DLT_RETURN_PIPE_ERROR) {
                    /* handle not open or pipe error */
                    close(dlt_user.dlt_log_handle);
                    dlt_user.dlt_log_handle = -1;
                }

                /* keep message in ringbuffer */
                DLT_SEM_FREE();
                return ret;
            }
        }

        DLT_SEM_FREE();
    }

    return DLT_RETURN_OK;
}

void dlt_user_log_reattach_to_daemon(void)
{
    uint32_t num;
    DltContext handle;
    DltContextData log_new;

    if (dlt_user.dlt_log_handle < 0) {
        dlt_user.dlt_log_handle = DLT_FD_INIT;

#ifdef DLT_LIB_USE_UNIX_SOCKET_IPC
        /* try to open connection to dlt daemon */
        dlt_initialize_socket_connection();

        if (dlt_user.connection_state != DLT_USER_CONNECTED)
            /* return if not connected */
            return;

#elif defined DLT_LIB_USE_VSOCK_IPC
        dlt_initialize_vsock_connection();

        if (dlt_user.connection_state != DLT_USER_CONNECTED)
            return;

#else /* DLT_LIB_USE_FIFO_IPC */
        /* try to open pipe to dlt daemon */
        int fd = open(dlt_daemon_fifo, O_WRONLY | O_NONBLOCK);

        if (fd < 0)
            return;

        dlt_user.dlt_log_handle = fd;
#endif

        if (dlt_user_log_init(&handle, &log_new) < DLT_RETURN_OK)
            return;

#ifdef DLT_SHM_ENABLE

        /* init shared memory */
        if (dlt_shm_init_client(&dlt_user.dlt_shm, dltShmName) < DLT_RETURN_OK)
            dlt_vnlog(LOG_WARNING, DLT_USER_BUFFER_LENGTH, "Logging disabled,"
                      " Shared memory %s cannot be created!\n", dltShmName);

#endif

        dlt_log(LOG_NOTICE, "Logging (re-)enabled!\n");

        /* Re-register application */
        if (dlt_user_log_send_register_application() < DLT_RETURN_ERROR)
            return;

        DLT_SEM_LOCK();

        /* Re-register all stored contexts */
        for (num = 0; num < dlt_user.dlt_ll_ts_num_entries; num++)
            /* Re-register stored context */
            if ((dlt_user.appID[0] != '\0') && (dlt_user.dlt_ll_ts) && (dlt_user.dlt_ll_ts[num].contextID[0] != '\0')) {
                /*dlt_set_id(log_new.appID, dlt_user.appID); */
                dlt_set_id(handle.contextID, dlt_user.dlt_ll_ts[num].contextID);
                handle.log_level_pos = (int32_t) num;
                log_new.context_description = dlt_user.dlt_ll_ts[num].context_description;

                /* Release the mutex for sending context registration: */
                /* function  dlt_user_log_send_register_context() can take the mutex to write to the DLT buffer. => dead lock */
                DLT_SEM_FREE();

                log_new.log_level = DLT_USER_LOG_LEVEL_NOT_SET;
                log_new.trace_status = DLT_USER_TRACE_STATUS_NOT_SET;

                if (dlt_user_log_send_register_context(&log_new) < DLT_RETURN_ERROR)
                    return;

                /* Lock again the mutex */
                /* it is necessary in the for(;;) test, in order to have coherent dlt_user data all over the critical section. */
                DLT_SEM_LOCK();
            }
        DLT_SEM_FREE();
    }
}

DltReturnValue dlt_user_log_send_overflow(void)
{
    DltUserHeader userheader;
    DltUserControlMsgBufferOverflow userpayload;

    /* set userheader */
    if (dlt_user_set_userheader(&userheader, DLT_USER_MESSAGE_OVERFLOW) < DLT_RETURN_OK)
        return DLT_RETURN_ERROR;

    if (dlt_user.dlt_is_file)
        return DLT_RETURN_OK;

    /* set user message parameters */
    userpayload.overflow_counter = dlt_user.overflow_counter;
    dlt_set_id(userpayload.apid, dlt_user.appID);

    return dlt_user_log_out2(dlt_user.dlt_log_handle,
                             &(userheader), sizeof(DltUserHeader),
                             &(userpayload), sizeof(DltUserControlMsgBufferOverflow));
}

DltReturnValue dlt_user_check_buffer(int *total_size, int *used_size)
{
    if ((total_size == NULL) || (used_size == NULL))
        return DLT_RETURN_WRONG_PARAMETER;

    DLT_SEM_LOCK();

#ifdef DLT_SHM_ENABLE
    *total_size = dlt_shm_get_total_size(&(dlt_user.dlt_shm));
    *used_size = dlt_shm_get_used_size(&(dlt_user.dlt_shm));
#else
    *total_size = (int) dlt_buffer_get_total_size(&(dlt_user.startup_buffer));
    *used_size = dlt_buffer_get_used_size(&(dlt_user.startup_buffer));
#endif

    DLT_SEM_FREE();
    return DLT_RETURN_OK; /* ok */
}

#ifdef DLT_TEST_ENABLE
void dlt_user_test_corrupt_user_header(int enable)
{
    dlt_user.corrupt_user_header = enable;
}
void dlt_user_test_corrupt_message_size(int enable, int16_t size)
{
    dlt_user.corrupt_message_size = enable;
    dlt_user.corrupt_message_size_size = size;
}
#endif


int dlt_start_threads()
{
    /* Start housekeeper thread */
    if (pthread_create(&(dlt_housekeeperthread_handle),
                       0,
                       (void *)&dlt_user_housekeeperthread_function,
                       0) != 0) {
        dlt_log(LOG_CRIT, "Can't create housekeeper thread!\n");
        return -1;
    }

#ifdef DLT_NETWORK_TRACE_ENABLE
    /* Start the segmented thread */
    if (pthread_create(&(dlt_user.dlt_segmented_nwt_handle), NULL,
                       (void *)dlt_user_trace_network_segmented_thread, NULL)) {
        dlt_log(LOG_CRIT, "Can't start segmented thread!\n");
        return -1;
    }
#endif
    return 0;
}

void dlt_stop_threads()
{
    int dlt_housekeeperthread_result = 0;
    int joined = 0;

    if (dlt_housekeeperthread_handle) {
        /* do not ignore return value */
#ifndef __ANDROID_API__
        dlt_housekeeperthread_result = pthread_cancel(dlt_housekeeperthread_handle);
#else

#ifdef DLT_NETWORK_TRACE_ENABLE
        dlt_lock_mutex(&mq_mutex);
#endif /* DLT_NETWORK_TRACE_ENABLE */
        dlt_housekeeperthread_result = pthread_kill(dlt_housekeeperthread_handle, SIGUSR1);
        dlt_user_cleanup_handler(NULL);
#endif


        if (dlt_housekeeperthread_result != 0)
            dlt_vlog(LOG_ERR,
                     "ERROR %s(dlt_housekeeperthread_handle): %s\n",
#ifndef __ANDROID_API__
                     "pthread_cancel",
#else
                     "pthread_kill",
#endif
                     strerror(dlt_housekeeperthread_result));
    }

#ifdef DLT_NETWORK_TRACE_ENABLE
    int dlt_segmented_nwt_result = 0;

    if (dlt_user.dlt_segmented_nwt_handle) {
        dlt_lock_mutex(&mq_mutex);
        pthread_cond_signal(&mq_init_condition);
        dlt_unlock_mutex(&mq_mutex);

        dlt_segmented_nwt_result = pthread_cancel(dlt_user.dlt_segmented_nwt_handle);

        if (dlt_segmented_nwt_result != 0)
            dlt_vlog(LOG_ERR,
                     "ERROR pthread_cancel(dlt_user.dlt_segmented_nwt_handle): %s\n",
                     strerror(dlt_segmented_nwt_result));
    }
#endif /* DLT_NETWORK_TRACE_ENABLE */
    /* make sure that the threads really finished working */
    if ((dlt_housekeeperthread_result == 0) && dlt_housekeeperthread_handle) {
        joined = pthread_join(dlt_housekeeperthread_handle, NULL);

        if (joined != 0)
            dlt_vlog(LOG_ERR,
                     "ERROR pthread_join(dlt_housekeeperthread_handle, NULL): %s\n",
                     strerror(joined));

        dlt_housekeeperthread_handle = 0; /* set to invalid */
    }

#ifdef DLT_NETWORK_TRACE_ENABLE
    if ((dlt_segmented_nwt_result == 0) && dlt_user.dlt_segmented_nwt_handle) {
        joined = pthread_join(dlt_user.dlt_segmented_nwt_handle, NULL);

        if (joined != 0)
            dlt_vlog(LOG_ERR,
                     "ERROR pthread_join(dlt_user.dlt_segmented_nwt_handle, NULL): %s\n",
                     strerror(joined));

        dlt_user.dlt_segmented_nwt_handle = 0; /* set to invalid */
    }
#endif /* DLT_NETWORK_TRACE_ENABLE */
}

static void dlt_fork_child_fork_handler()
{
    g_dlt_is_child = 1;
    dlt_user_initialised = false;
    dlt_user.dlt_log_handle = -1;
}

DltReturnValue dlt_user_log_out_error_handling(void *ptr1, size_t len1, void *ptr2, size_t len2, void *ptr3,
                                               size_t len3)
{
    DltReturnValue ret = DLT_RETURN_ERROR;
    size_t msg_size = len1 + len2 + len3;

    DLT_SEM_LOCK();
    ret = dlt_buffer_check_size(&(dlt_user.startup_buffer), (int)msg_size);
    DLT_SEM_FREE();

    DLT_SEM_LOCK();

    if (dlt_buffer_push3(&(dlt_user.startup_buffer),
                         ptr1, (unsigned int)len1,
                         ptr2, (unsigned int)len2,
                         ptr3, (unsigned int)len3) == DLT_RETURN_ERROR) {
        if (dlt_user.overflow_counter == 0)
            dlt_log(LOG_WARNING, "Buffer full! Messages will be discarded.\n");

        ret = DLT_RETURN_BUFFER_FULL;
    }

    DLT_SEM_FREE();

    return ret;
}
